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Double convex lens Stock Photos and Images
RMMR6WDG–Engraving depicting a double convex lens, showing refraction of light and the conjugate focus (b,a). Dated 19th century
RF2BTGGYX–The double convex lens usually described as the part common to two spheres that intersect each other, vintage line drawing or engraving illustration.
RMRJ9375–An engraving depicting a demonstration of how white light is broken down into the spectrum and can be reconstructed into white light. Pencil of sunlight (left) passed through the prism and was thrown into a double convex lens with a card at the focus to observe spectrum. When the card is removed and the point the white light is displayed on the screen (right). Dated 19th century
RF2C9BW4J–A typical representation of a solar microscope with two lenses, one of which is the condenser and the other is a double convex lens with considerable
RF2BTGWDB–A double convex lens, showing that, when placed with their plane surfaces in contactand consequently the focal distance of this lens is nearly the cen
RMKJ1MBF–Engraving depicting a refracting telescope on an iron stand and fitted with a finder. The instrument has two double convex lenses and is known as the astronomical telescope. Dated 19th Century
RF2BTGHKH–A double convex lens of crown-glass, combined with a plano-convex lens of flint-glass, to overcome the dispersive effect for some of the colors withou
RMR735N7–Pottery jug from Andenne on three times two toes, convex with straight neck, kitchen utensils earthenware ceramic earthenware glaze lead glaze, hand-turned glazed fried Andennekan Bullet-shaped body triangular neck edge flat ear Three pairs of double toes quite untidy finish. Weak lens base archeology Poortugaal Albrandswaard pottery store water wash pour serve Soil discovery: Poortugaal terp I Mottegracht Slot V.
RMBCE75Y–A converging lens focuses the rays from a distant object by causing them to converge at a focal point behind the lens.
RF2BTGMEY–A typical representation of the types of lens, in the sequence of order 1-6 as, Double convex, Plano convex, Meniscus, Double concave, Plano concave a
RM2AJ095J–Appleton's dictionary of machines, mechanics, engine-work, and engineering . at they either converge,tending to a point beyond the lens, or diverge, as if they proceeded from a point before the lens; orbecome parallel, after converging or diverging. A double convex lens, Fig. 2581, is bounded by two convex spherical surfaces, whose centres are onopposite sides of the lens. It is equally convex when the radii of both surfaces (that is, the distancesfrom the centres to the circumferences of the circle they belong to) are equal, and unequally convexwhen their radii or distances are unequal. A pla
RMFAJ5XD–1962 - Curved Tokyo Hotel Exterior. Prevents TV ''Ghosting'': The recently completedannex of the New Otani hotel in Tokyo is said to be effective in preventing a ''ghost'' phenomenon double image in television screens, and due to its (eligible) surfaces also reduces turbulent gales hazardouz to (eligible) near the building. The new 144-meter high building (eligible) stories, acts like a convex lens reflecting light, (eligible) curves thows back radio waves in various direction (eligible) ''ghosting'' on TV screens and strong winds are (eligible) scattered, unlike high-rise building with (eligi
RF2B9GJ8D–Pottery jug from Andenne on three times two toes, convex with straight neck, kitchen utensils earthenware ceramic earthenware glaze lead glaze, hand-turned glazed fried Andennekan Bullet-shaped body triangular neck edge flat ear Three pairs of double toes quite untidy finish. Weak lens base archeology Poortugaal Albrandswaard pottery store water wash pour serve Soil discovery: Poortugaal terp I Mottegracht Slot V
RMPG43N1–. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. 198 USB OF THE MICEOSCOPE. the small condenser, before described at page 123; this, gene- rally speaking, is a double convex lens of two or three inches. Fig. 126. focus, either supported on a separate foot, or else attached to some Immovable part of the stand of the microscope, and should be so placed that the rays of light from the large condenser may fall upon it. These rays being slightly con- vergent, and fallin
RM2ABXEXR–A PRACTICAL CAMERA-Not a Toy. S5. DOUBLE-CONVEX ACHROMATIC LENS. NEW SAFETY SHUTTER FOR TIME AND INSTANTANEOUS EXPOSURES. BEST $5 CAMERA IN THE WORLD SUN ART'S `VENI VIDI VICI' SU NART MAGAZINE SUNART FOLDINGS SUNART PHOTO CO ROCHESTER N. Y. the Scientific American PUBLICATIONS FOR 1891. RATES BY MAIL. COMBINED RATES TO FOREIGN COUNTRIES. FROM THE U. S. OOVERNITENT. DENSMORE TYPEWRITER CO. 316 Broadway N. Y. TIM Typoritor EXCHANGE THE NEW LICHT TALKING MACHINES HONOGRAPHS GRAPHOPHONES Reproduce Songs Bands Orchestras and your own voice. MACHINE CO. CHICAGO. ONLY $26. CHICAGO TALKING 107
RF2HKFF0T–Technician in laboratory using a large illuminated magnifying glass to view electrical component and circuit boards.
RF2C800T0–3D graphical image of mirror vertically along with text built by metallic cubic letters from the top perspective, excellent for the concept presentation and slideshows. background and illustration
RF2HKFET9–Technician in laboratory using a large illuminated magnifying glass to view electrical component and circuit boards.
RMKJ1MB9–Engraving depicting the arrangement of lenses in Galileo Galilei's telescope. This had two double convex lenses. Galileo Galilei (1564-1642) an Italian polymath, physicist, philosopher, mathematician, and astronomer. Dated 19th Century
RFPHJ96F–set of flat-convex glass optical magnifying lenses and a small double-convex lens isolated with clipping path
RM2AWYXMF–The microscope and its revelations . scription is called a plano-convex lens; and it wiH hereafterbe shown to possess properties, which render it very useful inthe construction of microscopes. But if, instead of passingthrough a plane surface, the rays re-enter the air through asecond convex surface, turned in the opposite direction, as ina double-convex lens, they wiU be made to converge still more.This will be readily comprehended, when it is borne in mindthat the contrary direction of the second surface, and the con-trary direction of its refraction (this being/rom the densermedium, instead
RF2BTGF3N–Double convex lenses mainly used as spectacles for old people, becoming more spherical according to the age of the person or the magnifying power requ
RMPG442X–. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. Fig. 24. A square hole is made in the end of the handle of fig. 23, and a round one in the middle of that of fig. 24, for the pur- pose of attaching them to a stand, as wiU be subsequently shown. Mr. Smith generally puts three lenses into one handle, the highest power is a planoconvex, the next a crossed lens, and the lowest a double convex lens; these, when com- bined, perform uncommonly weU. When a higher magnifyin
RF2C9EJGH–3D graphical image of mirror vertically along with text built by metallic cubic letters from the top perspective, excellent for the concept presentation and slideshows. background and illustration
RF2HKFETA–Technician in laboratory using a large illuminated magnifying glass to view electrical component and circuit boards.
RMKJ1MBB–Engraving depicting the arrangement of lenses in Johannes Kepler's telescope. This had two double convex lenses and gave a wider field of view. Johannes Kepler (1571-1630) a German mathematician, astronomer, and astrologer. Dated 19th Century
RF2HKFEWT–Technician in laboratory using a large illuminated magnifying glass to view electrical component and circuit boards.
RFPHJ970–optical system of flat-convex lenses, collected to the tower and small double-convex glass on top
RM2AG0DBM–. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. , it would be better that the lens nextthe lamp should be rather deeper in curve, but the great heatmakes this undesirable. With the lime-light it is different,and in considering the very best form, it is well to understandthe principles upon which the correction of aberrationsdepends. This has been very familiarly explained in thediagram, fig. 11, by Mr.Robert Bow. Here d e re-presents the upper half ofa plano-convex lens, thefaint line he the outlineof a double convex lens incontact with i
RF2BTH0M6–The figure showing lenses of various forms illustrated in a sequence of order, a to i, represented as prism, plane glass, spherical lens, double-conve
RF2BTH953–The figure shows the pencil of converging rays that are convergent as they pass through the lensand brought to a focus nearer the lens, in proportion
RFEW9J65–Biconvex lens, vintage engraved illustration. Usual Medicine Dictionary by Dr Labarthe - 1885.
RMPG43R0–. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. MAGNirYING POWEES. 159 it will be i^equisite, in the first place, that certain terms, such as spherical and chromatic aberration, be fuUy under- stood. Most persons are familiar with the fact, that when parallel rays of light fall upon a piano or double convex lens, they are brought to a point at a certain distance from the lens, which point is termed their focus. Thus sup- pose in fig. Ill that the rays, L L, &c
RF2HKFEW2–Technician in laboratory using a large illuminated magnifying glass to view electrical component and circuit boards.
RM2AXHEXX–Human physiology : designed for colleges and the higher classes in schools and for general reading . This experiment, which can be performed by any one, illustratesin a rude way the principle of the camera obscura. The realinstrument has a tube with a double convex lens, so as to collecttogether the rays from objects, and concentrate them upon asmall space, thereby making a very distinct small image ofthem The eye is a very beautiful and perfect instrument otthis sort The space filled by the vitreous humor is the dark-ened room; the pupil answers to the hole in the window shut- 25* 294 HUMAN P
RFEW92T7–Biconvex lens, vintage engraved illustration. Usual Medicine Dictionary by Dr Labarthe - 1885.
RMPFN77X–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Parallel rays falling on a plano-convex lens brottght to a focus at the distance of its diameter, arid vice versa. if a double convex lens will bring parallel rays to a focus in the centre of its sphere of curva- ture, it will on the other hand cause rays to assume a parallel direction, which are diverging from its focus ; so that if a luminous body were placed in that point, all its cone of rays, which fell upon the surface of the lens, would pass out in a cylindrical form. Again, if rays al- ready converging fall upon
RF2C9BN9R–A simple refracting telescope that consists of a tube, containing two convex lenses, one having a longand the other a short, focal distance, vintage l
RF2BTGK7G–The figure shows the observed results when diverging rays fall on the surface of the same lensand that is according to the degrees of their divergency
RF2C9C77D–An experimental set-up, with a watch, a large rubber toy balloon filled with carbon dioxide and a glass funnel. Constructed in a way to observe, sound
RF2HKFEXA–Technician in laboratory using a large illuminated magnifying glass to view electrical component and circuit boards.
RM2AFYAWR–. Good and bad eyesight : and the exercise and preservation of vision. ing or refractionof the rays which we have seen to be a property oflenses. Let us repeat in Fig. 12 the conditions shownin Fig. 11, with the exception that we fill the aperturec d by a double convex lens, and that we place thescreen b at the focal distance of this lens. In thesecircumstances, the cone of light issuing from the summitof the flame, being refracted by the lens, will be re-united at the point 1, the direction of the axial ray ofthe cone remaining unchanged but all the others being 44 EYESIGHT. brought to unite
RMPFN784–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Parallel rays fulling on a double convex lens brought to a focus in its centre ; and rays diverging from Mich a point rendered parallel. Fig. 147.. Parallel rays falling on a plano-convex lens brottght to a focus at the distance of its diameter, arid vice versa. if a double convex lens will bring parallel rays to a focus in the centre of its sphere of curva- ture, it will on the other hand cause rays to assume a parallel direction, which are diverging from its focus ; so that if a luminous body were placed in that point,
RM2AM621J–A companion to the United States pharmacopia; . e, or ocular, the first ofwhich is the magnifying lens, and isattached to the lower end of the body,while the other is a small tube slidinginto the upper part of the draw-tubeand carrying a combination of lensesfor enlarging or amplifying the imagemade by the objective. The relation of the optical parts toeach other are shown in Fig. 550. The objective should be correctedfor chromatic and spherical aberration,which is done by combining a double-convex lens of crown-glass and a plano-concave lens of flint-glass (doublet).In the better class of obj
RMPG43PD–. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. MAGNIFYING POWERS. 161 fering with definition. The spherical aberration may be con- siderably diminished by attending to the figm^e of the lens employed; thus, if it be a planoconvex, the convex side should be placed towards the eye, if a double convex, it has been found in practice that one whose radii are in the proportion of one to six is the form in which the aberration is the least; but it can be entirely got ri
RM2AFYAEH–. Good and bad eyesight : and the exercise and preservation of vision. owing : A Double-convex Lens, b, is bounded by two convexspherical surfaces, whose centres are on opposite sidesof the lens. It is equally convex when the radii ofboth surfaces are equal, and unequally convex whenthe radii are unequal. A Plano-convex Lens, c, is bounded by a plane sur-face on one side, and a convex on the other. A Meniscus (that is, a little moon, or crescent), d, isbounded by a concave and a convex surface, and thesetwo surfaces meet, if continued, so that the element ofconvexity preponderates. PROPERTIES
RMPG3H2B–. How to use the microscope; a guide for the novice. Microscopes. THE SIMPLE MICROSCOPE 5 sometimes useful, as it can be held to the eye while the hands are left free to manipulate the object. The Coddington lens used to be held in high esteem ; it is a thick, double-convex glass grooved about the middle, the groove being blackened and acting as a diaphragm. It gives fair magnifying power, but has some imperfections ; thus, it does not yield a sufficiently large and flat field, and the working distance between lens and object is too short. It has to be remembered that working distance lessens
RM2AJ2F5H–Elements of natural philosophy (Volume 2-3) . after deviation, we find fnI /< / is to concentratethe light Hence the effect That is to say, when the rays diverge before deviation,of a convex lens they will diverge less after; and when they converge be-fore deviation, they will converge more after. Hence weconclude, that the tendency of a convex lens is to collectthe rays, or concentrate the waves of light deviated by it.The focal distance of the double convex lens is givenby Equation (27), ELEMENTS OF OPTICS. 207 / = -, f.r.r Focal distance; rr —/ (m — 1) (r + rr) If the lens be supposed of
RMPFN762–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. MICROSCOPE. 335 towards the object, the aberration is 4| times the thickness of the lens. Hence, when a plano- convex lens is employed, its convex surface should be turned towards a distant object, when it is used to form an image by bringing to a focus parallel or slightly-diverging rays; but it should be turned towards the eye, when it is used to render parallel the rays which are diverging from a very near object. The single lens having the least spherical aberration is a double convex, whose radii are as 1 to 6. When
RM2AKXYX2–The Pharmaceutical era . des may hold conversation without be-ing heard by those who are stationed between. Refraction and Diffraction of Sound.—By the refraction ofsound is meant the change in direction caused by the en-trance into or passing through a medium of differentdensity. If between a source of sound, as a watch, andthe ear there may be interposed a thin balloon filled withsome dense gas, as carbon dioxid, the sphere of gas willoperate as a double-convex lens and cause the soundwaves to converge to a focus on the opposite side, wherethey will be heard more distinctly than at interveni
RM2AFJBT0–. Laboratory exercises in elementary physics. Fig. ! LIGHT.EXERCISE 1. FOCI OF LENSES. Preliminary.—When the light from a luminous body-passes through a double convex lens, the point at whichall the light is concentrated is called the focus of the lens.The distance from the centre of the lens to the focus iscalled the focal length. The following exercise investigatesthe effect on the focal length of the distance of the objectfrom the lens. The apparatus shown in Fig. 99 is used.. For the luminous object near the lens we use a light A,represented as a candle mounted upon a block C, whichslides
RM2AFYBEE–. Good and bad eyesight : and the exercise and preservation of vision. q, so that it now formsa double convex lens. The central ray c proceeds atright angles through both surfaces, and reaches Fr orf, without deviation. The rays b, d, a, e are re-fracted towards the perpendiculars on passing into thedense medium at the points hy k, g, /, but on quitting itthey are refracted from the perpendiculars to the surfaceof the rare medium, at the points ?t, p, m, q. This new THE FORMATION OF IMAGES. 39 refraction increases the convergence of the rays, andbrings them to a focus f, nearer to the dense me
RM2AKMEF4–Ocular refraction and the shadow test . s is true, the effects created are not so noticeable in the weak-er power lenses as m the stronger ones, a lens of two inches so calledfocus has a focal power at the periphery of about 1.6 inches, whichgives a quite blurred image. The degree of aberration increases withthe size (aperture) of the lens and the power, also the form of thelens and the distance of the object A double convex lens has thegreatest aberration, and gives the most distortion, a piano convexless, and a periscopic the least. Persons who have worn glasses for years of a certain form f
RM2ANEYA7–Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . e-dium at A, is refracted to c, instead of pursuing its original course toiZ; when it passes intoa rarer medium again at c, it is again refracted in a new course down to d, instead of/. Figure 8. The Lenses.—a, Single convex lens, b, Single concave lens, c, Double convex lens, d, Double concave lens, e, Concavo couvex lens. Figure 9. Short-sightedness—The image formed in front of the retina. Figure 10.
RM2AM5YP8–The London encyclopaedia, or Universal dictionary of science, art, literature, and practical mechanics, comprisiong a popular view of the present state of knowledge . in which A is the radiating point from which therays a, b, c. &c., diverge, and F is tlie focus ofthe lens B. These rays, after passing throughthe lens, continue to diverge in the space C D.389. The focus of the suns parallel rays, whentransmitted through a double convex lens, isshown in the annexed figure. The parallel rays. a r ^ ^ ^?^ ^^^ obliquely on tne surfaceA D of a double convex lens, are refracted orbent inward in glass
RM2AKW3W9–The Science record; a compendium of scientific progress and discovery . amera obscura, of which we give two forms. Fig. 8 is anarrangement adapted to taking views from windows orother fixed positions. It is a rectangular wooden box,formed of two parts, which slide in and out. The lumi-nous rays pass into the box by a double convex lens se-cured in place as represented in section 2, and form animage on the opposite side, which is at the focal distanceof the lens. But the rays are reflected from a glass mir-ror inclined at an angle of 450 and form an image on apiece of ground glass inserted abov
RM2AN4A0J–Annual report . 150pounds. What power must be applied at one-fourth the distancefrom the fulcrum to lift the weight? Draw figure. 3. How far will a body fall in 10 seconds in the latitude of NewYork? What will be its final velocity? 4. Define Specific Gravity. 5,. Name three ways in which heat may be transmitted. Illus-trate one of these. 6. Define sound. What determines the pitch of a sound?What is the speed of sound in air under standard conditions?Through which will sound travel most rapidly, a solid, a liquid or agas? 7. Describe the image produced by a double convex lens when-the object i
RM2AKW45D–The Science record; a compendium of scientific progress and discovery . fig. 7.. AIDS TO DRAWING.—FIG. 8.—THE CAMERA OBSCURA. 574 SCIENCE RECORD. THE CAMERA OBSCURA. One of the best known instruments, also based on opti-cal principles, and which may be used in drawing, is thecamera obscura, of which we give two forms. Fig. 8 is anarrangement adapted to taking views from windows orother fixed positions. It is a rectangular wooden box,formed of two parts, which slide in and out. The lumi-nous rays pass into the box by a double convex lens se-cured in place as represented in section 2, and form a
RM2AJ2GHP–Elements of natural philosophy (Volume 2-3) . 204 NATURAL PHILOSOPHY. Double convex § 45. As an example, let us take the double convex lens taken as an -i . lens. example; Equation (33), is Generalequation; / ff JL 1 F. f n Value forreciprocal ofprincipal focaldistance; and, Equation (30), and Table (A m — 1 F. u — m—l(- + ), and as long as m > 1, we shall have, Equation fordiscussion; / // F.. + f n (40) Fig. 27. For - > —, or / > Fit, f will be negative, and Fu f the vergency ofthe deviated Keal radiants rayS w[l )q ne-between . rp, principal focus g^tlVe. liiat and infinity;
RM2CEH7XG–. Bicycles and supplies. THE DEMONNickel-plated Although the DEMON is renowned as acheap oil lamp, yet it is so thoroughly well made thatit will compare favorably with the best. It containsall the latest improvements, sliding side lights,screw sockets, best double convex lens. The body opens upwards, exposing the wholeof the interior for cleaning. It has the best class of spring back as appliedto the higher grade lamps, which makes it a superiorarticle altogether. Price, less bracket, each $1 00 Acetylene Lamp Burners SOLAR AND COLUMBIALAMP LAVA TIPS PANTHER LAMP BURNER.
RM2CEHP2A–. Human physiology : designed for colleges and the higher classes in schools, and for general reading. This experiment, which can be performed by any one, illustratesin a rude way the principle of the camera obscura. The realinstrument has a tube with a double convex lens, so as to collecttogether the rays from objects, and concentrate them upon asmall space, thereby making a very distinct small image ofthem. The eye is a very beautiful and perfect instrument ofthis sort. The space filled by the vitreous humor is the dark-ened room; the pupil answers to the hole in the window shut- 25* 294 . H
RM2CEH8AG–. Bicycles and supplies. THE DEMONNickel-plated Although the DEMON is renowned as acheap oil lamp, yet it is so thoroughly well made thatit will compare favorably with the best. It containsall the latest improvements, sliding side lights,screw sockets, best double convex lens. The body opens upwards, exposing the wholeof the interior for cleaning. It has the best class of spring back as appliedto the higher grade lamps, which makes it a superiorarticle altogether. Price, less bracket, each $1 00 Acetylene Lamp Burners SOLAR AND COLUMBIALAMP LAVA TIPS PANTHER LAMP BURNER
RM2CHTCAK–. Nature . minute is indicated by a weakening of theimage. In the actual apparatus the sphere is an ordinaryround-bottomed flask about 95 mm. in diameter, and thelens a simple double convex lens of about 90 mm. focallength. The sensitive paper employed is the ordinaryferro-prussiate paper now so much used by engineers forcopying tracings. This was selected in consequence ofthe ease with which the impression is fixed, for the papermerely requires to be washed in a stream of water for sixminutes, no chemicals being necessarv. When the paperis dry, radial lines containing between them angles of 1
RM2CE4WMJ–. Our senses series; . ove our eyes so as to get clearimages of the moving or interesting object,vaguely caught sight of through the sides of theretina. We have yet to mention the apparatus for ac-commodating the rays of light from various dis-tances to the retina. In a camera this is accom-plished by moving a solid, unchangeable double-convex lens back and forth until a clear image iscast upon the sensitive plate. It is obvious thatthe double-convex lens of the eye, since it is insidethe eyeball firmly swung by the suspensory liga-ment just back of the iris, cannot be pushed backand forth to
RM2CEP1CC–. The London, Edinburgh and Dublin philosophical magazine and journal of science. and /uL the index of refraction, then the error produced by Measurement of the Refractive Index of Liquids. 307 the spherical aberration of a parallel beam may be written AF = R8a20(/u), (9) A/=-RaVM, (10) where (/>(//,) and ^{fi) are certain functions depending on thetype of lens employed. The curves are drawn for (1) asphere, (2) a plano-convex lens with light incident on curvedface, (3) a plano-convex lens with light incident on plane face,(4) double convex lens with faces of equal curvature. Fig. 2represen
RM2CH1835–. Color-vision and color blindness, a practical manual for railroad surgeons . FlG. 9.—DiAGRASI ILLUSTRATING THE RECOMPOSITION OF WHITE LIGHT. duced by combining the colored rays. If the spectrumbe allowed to fall upon a double-convex lens (Fig. 9),the rays are re-united to form a pencil of white light onthe screen F^ placed at the focus of the lens. That white light can be produced from a combina-. FiG. 10.—Newtons Disc. tion of the spectral colors can be demonstrated by meansof Newtons disc. This consists of a card-board discabout one foot in diameter, upon which is pasted stripsof colored p
RM2CE1F7T–. A text book of physics, for the use of students of science and engineering . Fig. 542.—Convex lens. Example.—A double convex lens has radii of curvature 16 and 24 cm.respectively, and the glass has index of refraction 1-5. Find the focallength of the lens, and the position of the image when the object is 32 cm.from it. r1= - 24 and ra = +16; In Fig. 542, 1 / 1 1 l/5 (from equation . /= -??= -19-2 cm. 1 Again, 96 5 1 1 . v uf132 I 96 115 2 v32 96 96 v= -48; that is, the image is 48 cm. from the lens on the side remotefrom the object. EXPT. 128.—Focal length of a converging lens. Place
RMRNA1H1–. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. 174 THE EYE AND ITS APPENDAGES. The canal of Petit^ is formed between the laminae of the hyaloid membrane, and surrounds the edge of the lens. The zone of Zinn, is a circle of plaitings upon the vitreous humour, which dove-tail with the ciliary processes. The crystalline lens^ is a double convex lens, whose posterior surface is more convex than its anterior. In childhood it is spherical, and in old age it is flattene
RMRN72W6–. The anatomy of the human body. Human anatomy; Anatomy. ARTICULATIONS OF THE VERTEBRAL COLUMN. 117 59, 60, and 68) consists of a kind of disc, which fills up the lenticular space between the bodies of the vertebrae, and might, with propriety, be called intervertebral disc. Each disc has the form of a double convex lens, and is so closely united by its upper and under surfaces to the corresponding vertebrae, that it is easier to break the bones than to destroy this connexion. Its circumference adheres to the anterior and posterior com- mon ligaments, and contributes to form the intervertebral
RMRE3THM–. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. 856 PHYSIOLOGY OF THE DOMESTIC ANIMALS. equal refracting power. Of the one a double convex lens is made, of the other a double concave, and the two combined. They must be of dif- ferent dispersive power, or the degree of concavity which would correct the chromatic aberration would also destroy the converging power of the convex lens. In crown glass and flint glass we have such media. The flint glass has greater dispersive power, hence the degree of concavity necessary to correct the chromatic aberration wi
RMRE02H8–. The physiology of the domestic animals; a text-book for veterinary and medical students and practitioners. Physiology, Comparative; Domestic animals. 856 PHYSIOLOGY OF THE DOMESTIC ANIMALS. equal refracting power. Of the one a double convex lens is made, of the other a double concave, and the two combined. They must be of dif- ferent dispersive power, or the degree of concavity which would correct the chromatic aberration would also destroy the converging power of the convex lens. In crown glass and flint glass we have such media. The flint glass has greater dispersive power, hence the degre
RMRE3TH8–. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. Fig 378.—Diagram illustrating the Formation, by a Double Convex Lens, of a Smaller Inverted Image. (Gemot.) must be formed behind the lens. If a screen be placed at this point, which corresponds to the focal length of the lens, it is evident that the image will be distinctly defined. On the other hand, if the screen be either approached or removed farther from the lens an indistinct image will be formed. If the object be farther removed from the lens the image will decrease in size, and to have a distinct
RMRE02GK–. The physiology of the domestic animals; a text-book for veterinary and medical students and practitioners. Physiology, Comparative; Domestic animals. Fia. 378.—Diagram illustrating the Formation, by a Double Convex Lens, of a Smaller Inverted Image. (Oanot.) must be formed behind the lens. If a screen be placed at this point, which corresponds to the focal length of the lens, it is evident that the image will be distinctly defined. On the other hand, if the screen be either approached or removed farther from the lens an indistinct image will be formed. If the object be farther removed from t
![. The microscope; a simple handbook. Microscopes. 12 THE MICROSCOPE The object glass. The object glass (R) in the earliest instruments was a single double convex lens (Fig. 2); it gave an enlarged but very im- perfect picture of small objects, the outlines were ,j^^^^, surrounded by coloured fringes, and the details "^^J-s:^ were fuzzy and indistinct. Such lenses were made Fia. 2. several himdred years ago, but in the early part of the nineteenth century is was discovered that the defects of a single lens could be overcome by using several lenses m combination, made of difierent kinds of Stock Photo](https://c8.alamy.com/comp/RDRY7T/the-microscope-a-simple-handbook-microscopes-12-the-microscope-the-object-glass-the-object-glass-r-in-the-earliest-instruments-was-a-single-double-convex-lens-fig-2-it-gave-an-enlarged-but-very-im-perfect-picture-of-small-objects-the-outlines-were-j-surrounded-by-coloured-fringes-and-the-details-quotj-s-were-fuzzy-and-indistinct-such-lenses-were-made-fia-2-several-himdred-years-ago-but-in-the-early-part-of-the-nineteenth-century-is-was-discovered-that-the-defects-of-a-single-lens-could-be-overcome-by-using-several-lenses-m-combination-made-of-difierent-kinds-of-RDRY7T.jpg ". The microscope; a simple handbook. Microscopes. 12 THE MICROSCOPE The object glass. The object glass (R) in the earliest instruments was a single double convex lens (Fig. 2); it gave an enlarged but very im- perfect picture of small objects, the outlines were ,j^^^^, surrounded by coloured fringes, and the details "^^J-s:^ were fuzzy and indistinct. Such lenses were made Fia. 2. several himdred years ago, but in the early part of the nineteenth century is was discovered that the defects of a single lens could be overcome by using several lenses m combination, made of difierent kinds of Stock Photo")
RMRDRY7T–. The microscope; a simple handbook. Microscopes. 12 THE MICROSCOPE The object glass. The object glass (R) in the earliest instruments was a single double convex lens (Fig. 2); it gave an enlarged but very im- perfect picture of small objects, the outlines were ,j^^^^, surrounded by coloured fringes, and the details "^^J-s:^ were fuzzy and indistinct. Such lenses were made Fia. 2. several himdred years ago, but in the early part of the nineteenth century is was discovered that the defects of a single lens could be overcome by using several lenses m combination, made of difierent kinds of
RMRN4MT0–. Animal and vegetable physiology considered with reference to natural theology. Natural theology; Physiology; Plant physiology; Biology. VISION. 409 with tolerable exactness, to produce the con- vergence of parallel rays to a focus; and by making. the denser medium convex on both sides (as shown in Fig. 410), both surfaces will conspire in pro- ducing the desired effects. Such an instrument is termed a double convex lens; and it has the pro- perty of collecting into a focus rays proceeding from distant points. Having obtained this instrument, we may now venture to enlarge the aperture through
RMRGB338–. Bulletin : report of Agricultural Experiment Station, Agricultural and Mechanical College, Auburn, Ala. Agriculture -- Alabama. 76. Fig. 19. This cut (after Schlampi)) illustrates how the double convex lens is employed in illuminating the eye or parts of the eye for the pur- pose of examination. The examination is made in a dark room or at night; the glass lens is moved forward and backward until the candle's rays are focussed upon the desired part or various parts, as it is upon the cornea and lens in the above cut. or window sliould be backward from tlie head and outward from the slioulder
RMRDDYC2–. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. 198 USB OF THE MICEOSCOPE. the small condenser, before described at page 123; this, gene- rally speaking, is a double convex lens of two or three inches. Fig. 126. focus, either supported on a separate foot, or else attached to some Immovable part of the stand of the microscope, and should be so placed that the rays of light from the large condenser may fall upon it. These rays being slightly con- vergent, and fallin
![. The microscope; an introduction to microscopic methods and to histology. Microscopes. Fig. 12.—Double Convex Lens, Showing Chromatic Aberration. The ray of white light (w) is represented as dividing into the short waved, bine [b) and the long waved, red (r) light. The blue (b) ray comes to a focus nearer the lens and the red ray (r) farther from the lens than the principal focus ( /). Principal focus ( /') for rays very near the axis ; f and f", foci of blue and red light coming from near the edge of the lens. The intermediate wave lengths would have foci all the way between f and f&quo Stock Photo](https://c8.alamy.com/comp/RE061Y/the-microscope-an-introduction-to-microscopic-methods-and-to-histology-microscopes-fig-12double-convex-lens-showing-chromatic-aberration-the-ray-of-white-light-w-is-represented-as-dividing-into-the-short-waved-bine-b-and-the-long-waved-red-r-light-the-blue-b-ray-comes-to-a-focus-nearer-the-lens-and-the-red-ray-r-farther-from-the-lens-than-the-principal-focus-principal-focus-for-rays-very-near-the-axis-f-and-fquot-foci-of-blue-and-red-light-coming-from-near-the-edge-of-the-lens-the-intermediate-wave-lengths-would-have-foci-all-the-way-between-f-and-fquo-RE061Y.jpg ". The microscope; an introduction to microscopic methods and to histology. Microscopes. Fig. 12.—Double Convex Lens, Showing Chromatic Aberration. The ray of white light (w) is represented as dividing into the short waved, bine [b) and the long waved, red (r) light. The blue (b) ray comes to a focus nearer the lens and the red ray (r) farther from the lens than the principal focus ( /). Principal focus ( /') for rays very near the axis ; f and f", foci of blue and red light coming from near the edge of the lens. The intermediate wave lengths would have foci all the way between f and f&quo Stock Photo")
RMRE061Y–. The microscope; an introduction to microscopic methods and to histology. Microscopes. Fig. 12.—Double Convex Lens, Showing Chromatic Aberration. The ray of white light (w) is represented as dividing into the short waved, bine [b) and the long waved, red (r) light. The blue (b) ray comes to a focus nearer the lens and the red ray (r) farther from the lens than the principal focus ( /). Principal focus ( /') for rays very near the axis ; f and f", foci of blue and red light coming from near the edge of the lens. The intermediate wave lengths would have foci all the way between f and f&quo
RMRE2JTJ–. The microscope; an introduction to microscopic methods and to histology. Microscopes. 'OBJECTIVE MIRROR Fig. 3. A Compound Microscope Helping THE Eye to Form a Retinal Image or a Near Object. Mirror The plane and concave mirror to re- flect light through the object. Object The smaU object to be seen by the eye. Objective The objective of the compound micro- scope to form a real image of the small object. Axis The principal optic axis of the micro- scope. / Principal focus of the ocular and of the ob- jective. r im The real image formed by the objective. Ocular The double convex lens enabling
RMRHA0KJ–. The botanist's companion; or, Directions for the use of the microscope. Botany; Microscopy. 4 SIMPLE AND COMPOUND MICROSCOPES. times three lenses are used, a double concave of flint-glass, placed between ^ « two double convex of crown-glass, and ground to certain curvatures; and in that case they cannot be cemented. The most perfect combination of lenses, for high powers, consists of eight distinct lenses:—In front, a triplet of two plano- convex lenses of crown-glass, with a plano-concave of dense flint-glass between them; next, a doublet composed of a I'ig- 7. double convex lens of crown-g
RMRDE012–. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. Fig. 24. A square hole is made in the end of the handle of fig. 23, and a round one in the middle of that of fig. 24, for the pur- pose of attaching them to a stand, as wiU be subsequently shown. Mr. Smith generally puts three lenses into one handle, the highest power is a planoconvex, the next a crossed lens, and the lowest a double convex lens; these, when com- bined, perform uncommonly weU. When a higher magnifyin
![. The microscope; an introduction to microscopic methods and to histology. Microscopes. Ch. IX] LENSES AND THEIR PRINCIPAL FORMS 1 2 3 283. Etc. 167. Spherical Lenses with their Forms and Principal Features. (i) Double convex lens showing the two spheres from which it was derived. c-c' the centers of the two spheres with the principal axis of the lens on the line joining the centers. (2) Double concave lens and the two spheres from which it was derived, c-c' centers of the spheres and axis of the lens. (3) Plano-convex lens with the sphere from which it was derived. In this case the axis is on Stock Photo](https://c8.alamy.com/comp/RE2HGH/the-microscope-an-introduction-to-microscopic-methods-and-to-histology-microscopes-ch-ix-lenses-and-their-principal-forms-1-2-3-283-etc-167-spherical-lenses-with-their-forms-and-principal-features-i-double-convex-lens-showing-the-two-spheres-from-which-it-was-derived-c-c-the-centers-of-the-two-spheres-with-the-principal-axis-of-the-lens-on-the-line-joining-the-centers-2-double-concave-lens-and-the-two-spheres-from-which-it-was-derived-c-c-centers-of-the-spheres-and-axis-of-the-lens-3-plano-convex-lens-with-the-sphere-from-which-it-was-derived-in-this-case-the-axis-is-on-RE2HGH.jpg ". The microscope; an introduction to microscopic methods and to histology. Microscopes. Ch. IX] LENSES AND THEIR PRINCIPAL FORMS 1 2 3 283. Etc. 167. Spherical Lenses with their Forms and Principal Features. (i) Double convex lens showing the two spheres from which it was derived. c-c' the centers of the two spheres with the principal axis of the lens on the line joining the centers. (2) Double concave lens and the two spheres from which it was derived, c-c' centers of the spheres and axis of the lens. (3) Plano-convex lens with the sphere from which it was derived. In this case the axis is on Stock Photo")
RMRE2HGH–. The microscope; an introduction to microscopic methods and to histology. Microscopes. Ch. IX] LENSES AND THEIR PRINCIPAL FORMS 1 2 3 283. Etc. 167. Spherical Lenses with their Forms and Principal Features. (i) Double convex lens showing the two spheres from which it was derived. c-c' the centers of the two spheres with the principal axis of the lens on the line joining the centers. (2) Double concave lens and the two spheres from which it was derived, c-c' centers of the spheres and axis of the lens. (3) Plano-convex lens with the sphere from which it was derived. In this case the axis is on
RMRJCY54–. Chamber's scientific reader : illustrated with wood engravings. Readers. 74 PHYSIOLOGY OF THE HUMAN BODY. of the eye, 10, arid also the -posterior, 11, or that part behind the iris and in front of the crystalline lens, 12. The crystalline lens is a humonr like a thick, transparent jelly, enclosed in a transparent hag, and attached to the choroid, so as to keep it in its place immediately behind the pupil. As a whole, it forms a double-convex lens (Optics, p. 28), but with the posterior surface more convex than the anterior. Filling the whole cavity behind the crystalline lens is the vitreous
RMRE2JRX–. The microscope; an introduction to microscopic methods and to histology. Microscopes. Object ^ ^ '- Fig. s-6. Vision by the Unaided Eye and by the Aid of a Simple Microscope. Fig. 5. Unaided Eye Vision. Axis, the Principal Optic Axis of the Eye Extended to the Object. Object The object to be seen; it is at a distance of 250 millimeters from the eye. r i The retinal image; it is inverted. Fig. 6. Vision by the Aid of a Simple Microscope. Axis, Principal Optic Axis of the Microscope and of the Eye. A^ B'- The object within the principal focus (F) of the lens. S M A double convex lens acting as
RMRDDYFC–. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. MAGNirYING POWEES. 159 it will be i^equisite, in the first place, that certain terms, such as spherical and chromatic aberration, be fuUy under- stood. Most persons are familiar with the fact, that when parallel rays of light fall upon a piano or double convex lens, they are brought to a point at a certain distance from the lens, which point is termed their focus. Thus sup- pose in fig. Ill that the rays, L L, &c
RMRDWJYW–. The elements of vegetable histology. Plant anatomy. Fig. 10.—Refraction oLLight Rays by Lenses. 1. Double convex lens causes convergence of rays to focal point (F). concave lens causes divergence of rays from focal point (F). 2. Double observer, it will be found that the reasons for these apparent enlargements of the image are different in the two cases. Objects placed beyond the focal point of a lens will give rise to enlarged images, termed real images, which can be projected upon a screen. The degree of enlargement is directly proportional. Please note that these images are extracted from
![. The microscope and microscopical methods. Microscopes; 1896. Fig. 12.—Double Convex Lens, Showing Chromatic Aberration. The ray of white light (a/) is represented as dividing into the short waved, blue (b) and the long waved, red (r) light. The blue (b) ray comes to a focus nearer the lens and the red ray {r) farther from the lens than the principal focus (/). Principal focus {f) for rays very near the axis, f andf", foci of blue and red light coming from near the edge of the lens. The intermediate wave lengths would have foci all the way between f andf". 7. Chromatic Aberration. Stock Photo](https://c8.alamy.com/comp/RE0642/the-microscope-and-microscopical-methods-microscopes-1896-fig-12double-convex-lens-showing-chromatic-aberration-the-ray-of-white-light-a-is-represented-as-dividing-into-the-short-waved-blue-b-and-the-long-waved-red-r-light-the-blue-b-ray-comes-to-a-focus-nearer-the-lens-and-the-red-ray-r-farther-from-the-lens-than-the-principal-focus-principal-focus-f-for-rays-very-near-the-axis-f-andfquot-foci-of-blue-and-red-light-coming-from-near-the-edge-of-the-lens-the-intermediate-wave-lengths-would-have-foci-all-the-way-between-f-andfquot-7-chromatic-aberration-RE0642.jpg ". The microscope and microscopical methods. Microscopes; 1896. Fig. 12.—Double Convex Lens, Showing Chromatic Aberration. The ray of white light (a/) is represented as dividing into the short waved, blue (b) and the long waved, red (r) light. The blue (b) ray comes to a focus nearer the lens and the red ray {r) farther from the lens than the principal focus (/). Principal focus {f) for rays very near the axis, f andf", foci of blue and red light coming from near the edge of the lens. The intermediate wave lengths would have foci all the way between f andf". 7. Chromatic Aberration. Stock Photo")
RMRE0642–. The microscope and microscopical methods. Microscopes; 1896. Fig. 12.—Double Convex Lens, Showing Chromatic Aberration. The ray of white light (a/) is represented as dividing into the short waved, blue (b) and the long waved, red (r) light. The blue (b) ray comes to a focus nearer the lens and the red ray {r) farther from the lens than the principal focus (/). Principal focus {f) for rays very near the axis, f andf", foci of blue and red light coming from near the edge of the lens. The intermediate wave lengths would have foci all the way between f andf". 7. Chromatic Aberration.
![. The microscope and microscopical methods. Microscopes; 1896. MICROSCOPE AND ACCESSORIES. CH. I. Fig. 12.—Double Convex Lens, Showing Chromatic Aberration. The ray of white light (a/) is represented as dividing into the short waved, blue (b) and the long waved, red (r) light. The blue (b) ray comes to a focus nearer the lens and the red ray {r) farther from the lens than the principal focus (/). Principal focus {f) for rays very near the axis, f andf", foci of blue and red light coming from near the edge of the lens. The intermediate wave lengths would have foci all the way between f an Stock Photo](https://c8.alamy.com/comp/RE0645/the-microscope-and-microscopical-methods-microscopes-1896-microscope-and-accessories-ch-i-fig-12double-convex-lens-showing-chromatic-aberration-the-ray-of-white-light-a-is-represented-as-dividing-into-the-short-waved-blue-b-and-the-long-waved-red-r-light-the-blue-b-ray-comes-to-a-focus-nearer-the-lens-and-the-red-ray-r-farther-from-the-lens-than-the-principal-focus-principal-focus-f-for-rays-very-near-the-axis-f-andfquot-foci-of-blue-and-red-light-coming-from-near-the-edge-of-the-lens-the-intermediate-wave-lengths-would-have-foci-all-the-way-between-f-an-RE0645.jpg ". The microscope and microscopical methods. Microscopes; 1896. MICROSCOPE AND ACCESSORIES. CH. I. Fig. 12.—Double Convex Lens, Showing Chromatic Aberration. The ray of white light (a/) is represented as dividing into the short waved, blue (b) and the long waved, red (r) light. The blue (b) ray comes to a focus nearer the lens and the red ray {r) farther from the lens than the principal focus (/). Principal focus {f) for rays very near the axis, f andf", foci of blue and red light coming from near the edge of the lens. The intermediate wave lengths would have foci all the way between f an Stock Photo")
RMRE0645–. The microscope and microscopical methods. Microscopes; 1896. MICROSCOPE AND ACCESSORIES. CH. I. Fig. 12.—Double Convex Lens, Showing Chromatic Aberration. The ray of white light (a/) is represented as dividing into the short waved, blue (b) and the long waved, red (r) light. The blue (b) ray comes to a focus nearer the lens and the red ray {r) farther from the lens than the principal focus (/). Principal focus {f) for rays very near the axis, f andf", foci of blue and red light coming from near the edge of the lens. The intermediate wave lengths would have foci all the way between f an
RMRD5CX6–. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Parallel rays falling on a plano-convex lens brottght to a focus at the distance of its diameter, arid vice versa. if a double convex lens will bring parallel rays to a focus in the centre of its sphere of curva- ture, it will on the other hand cause rays to assume a parallel direction, which are diverging from its focus ; so that if a luminous body were placed in that point, all its cone of rays, which fell upon the surface of the lens, would pass out in a cylindrical form. Again, if rays al- ready converging fall upon
RMRE3TJB–. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. SENSE OF SIGHT. 853 Refraction takes place not only through media with plane surfaces, but likewise through media bounded by curved surfaces, for the circum- ference of a circle may be supposed to be made up of a number of infinitely small, straight lines : this is indicated in the case of a lens in Fig. 371. Rays of light passing through a double convex lens in passing in are bent toward the perpendicular (Fig. 372). Now, if the rays thus acted upon be followed they will be found to meet at a point on the
![. Animal and vegetable physiology, considered with reference to natural theology. Biology; Physiology; Plant physiology; Natural theology. 324 THE SENSORIAL FUNCTIONS. a double convex lens; anil it has the property of collecting into a focus rays proccedinj; from distant points."^ 410. Ilavinii: obtained this instniincMil, wc mav now venture to enlarge the a])ertui'e tlii-oni;h wlilch the light was admit- ted into our dark chamber, and fit into the apertivrc a dou- ble convex lens. Vv'e hnve thus constructed the well known optical instrument called the Camera Ohscura, in which the imaj];e Stock Photo](https://c8.alamy.com/comp/RN4KY5/animal-and-vegetable-physiology-considered-with-reference-to-natural-theology-biology-physiology-plant-physiology-natural-theology-324-the-sensorial-functions-a-double-convex-lens-anil-it-has-the-property-of-collecting-into-a-focus-rays-proccedinj-from-distant-pointsquot-410-ilavinii-obtained-this-instniincmil-wc-mav-now-venture-to-enlarge-the-a-ertuie-tlii-onih-wlilch-the-light-was-admit-ted-into-our-dark-chamber-and-fit-into-the-apertivrc-a-dou-ble-convex-lens-vve-hnve-thus-constructed-the-well-known-optical-instrument-called-the-camera-ohscura-in-which-the-imaj-e-RN4KY5.jpg ". Animal and vegetable physiology, considered with reference to natural theology. Biology; Physiology; Plant physiology; Natural theology. 324 THE SENSORIAL FUNCTIONS. a double convex lens; anil it has the property of collecting into a focus rays proccedinj; from distant points."^ 410. Ilavinii: obtained this instniincMil, wc mav now venture to enlarge the a])ertui'e tlii-oni;h wlilch the light was admit- ted into our dark chamber, and fit into the apertivrc a dou- ble convex lens. Vv'e hnve thus constructed the well known optical instrument called the Camera Ohscura, in which the imaj];e Stock Photo")
RMRN4KY5–. Animal and vegetable physiology, considered with reference to natural theology. Biology; Physiology; Plant physiology; Natural theology. 324 THE SENSORIAL FUNCTIONS. a double convex lens; anil it has the property of collecting into a focus rays proccedinj; from distant points."^ 410. Ilavinii: obtained this instniincMil, wc mav now venture to enlarge the a])ertui'e tlii-oni;h wlilch the light was admit- ted into our dark chamber, and fit into the apertivrc a dou- ble convex lens. Vv'e hnve thus constructed the well known optical instrument called the Camera Ohscura, in which the imaj];e
RMRE02J3–. The physiology of the domestic animals; a text-book for veterinary and medical students and practitioners. Physiology, Comparative; Domestic animals. SENSE OP SIGHT. 853 Refraction takes place not only through media with plane surfaces, but likewise through media bounded by curved surfaces, for the circum- ference of a circle may be supposed to be made up of a number of infinitely small, straight lines: this is indicated in the case of a lens in Fig. 371. Rays of light passing through a double convex lens in passing in are bent toward the perpendicular (Fig. 372). Now, if the rays thus acted
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