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Optics |
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Aberration "In optics, a deviation in the rays of light when unequally refracted by a lens or reflected by a mirror, so that they do not converge and meet in a point or focus, but separate, forming an ind... |
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Angle of vision "The angle under which the rays of light, coming from the extremities of an object, cross each other at the eye, bears a proportion directly to the length, and inversely to the distance of the object.... |
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Aperature "If light from a highly luminous body is admitted to a darkened room through a small hole in the shutter and ther received upon a white screen, it will form an inverted image of the object." -Avery 18... |
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Apparatus, Micrographic An apparatus used to photograph images in a light microscope. The long camera is connected to the eye piece while the microscope uses a mirror to light the specimen. The image is captured on the photo... |
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Arc lamp, carbon flame "Diagram of inclined carbon-flame arc lamp." —Croft 1917... |
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Biaxial Interference "A positive biaxial interference figure with the principal sections nearly corresponding to those of the nicols. The arrows indicate the movement taking place upon inserting a quartz wedge above the s... |
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Biaxial Interference "A biaxial interference figure showing the emergence of an optic axis. The arrow indicates the movement taking place upon inserting a quartz wedge above the section. The mineral is augite. (+)." -Joha... |
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Biaxial Interference, Negative "A negative biaxial interference figure. The arrows indicate the movement taking place upon inserting a quartz wedge above the section. Epidote. (-)." -Johannsen, 1908... |
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Biaxial Interference, Positive "A positive biaxial interference figure. The arrows indicate the movement taking place upon inserting a quartz wedge above the section. Olivine. (+)." -Johannsen, 1908... |
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Camera Lucida "An optical instrument employed to facilitate the sketching of objects from nature by producing a reflected picture of them upon paper. Wollaston's apparatus is one of the commonest. The essential p... |
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Camera Obscura "An optical instrument employed for exhibiting the images of objects in their forms and colors, so that they may be traced and a picture drawn, or may be represented by photography. A simple camera o... |
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Camera Obscura "Camera obscura strictly signifies a darkened chamber, because the room must be darkened, in order to observe its effects. To witness the phenomena of this instrument, let a room be closed in every d... |
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Camera Obscura "Camera obscura strictly signifies a darkened chamber, because the room must be darkened, in order to observe its effects. To witness the phenomena of this instrument, let a room be closed in every d... |
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Camera Obscura This image shows a woman creating an illustration using the camera obscura.... |
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Chormatic aberration "Because of their greater refrangibility, the focus of the violet rays is nearer the lens than the focus of the red rays, as illustrated. If the screen is as near the lens as the focus marked v, the o... |
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Color wheel, complementary "Any two colors standing opposite each other are complementary to each other. If such colors are blended, the resultant is white light; if any two alternate color are blended, the resultant will be t... |
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Compound Microscope "Nachet's Combined Simple and Compound Microscope." —The Encyclopedia Britannica, 1903... |
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Compound Microscope "Ross's Jackson-Zentmayer Compound Microscope." —The Encyclopedia Britannica, 1903... |
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Convex Lens "A modification of the simple kaleidoscope was introduced by Sir David Brewster, whereby the images of large and distant objects can be introduced into the picture. This is effected by removing the o... |
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Crystal Movement "Movement of the left bar...upon rotating the stage to the right, and movement of the colored rings upon inserting a quartz wedge." -Johannsen, 1908... |
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Cup and Shilling "The refraction of water is beautifully proved by the following simple experiment. Place an empty cup, with a shilling on the bottom, in such a position that the side of the cup will just hide the pi... |
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Diffraction "Throw a sunbeam through a very small opening in the shutter of a darkened room. Receive the beam upon a convex lens of short focal length, placing a pieve of red glass between the aperture and the le... |
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Diffraction grating A diagram of action of diffraction grating.... |
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Dispersion, Crossed "Crossed dispersion in a monoclinic crystal p>v." -Johannsen, 1908... |
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Dispersion, Horizontal "Horizontal dispersion in a monoclinic crystal. p |
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