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from article Low-temperature acoustics
Velocity of the various types of sound in superfluid 4He as a function of temperature. 1 m/s = 3.28 ft/s. °F = (K × 1.8) − 459.67.
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from article Optical microscope
Microscope objectives: (a) 16-mm (0.63-in.) dry achromat; (b) typical high-power dry achromat; (c) 2-mm (0.08-in.), NA 1.40, oil-immersion apochromat. (Photographic Service Department, Kodak Research Laboratory)
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from article Optical microscope
Two types of catadioptric objective. (a) Maksutov type. (b) 53X, NA 0.72, ultraviolet objective, designed by Gray. Glass elements in the latter serve purely as reflectors. (Photographic Service Department, Kodak Research Laboratory)
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from article Optical microscope
Diagram of light microscope. (American Optical Corp.)
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from article Optical microscope
Optical diagram of inverted microscope.
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from article Optical microscope
Diagram of light rays as they pass through a binocular biobjective microscope.
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from article Optical microscope
Light path in critical illumination. (American Optical Corp.)
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from article Optical microscope
Light path in Köhler illumination. (American Optical Corp.)
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from article Optical microscope
Dark-field illumination. (American Optical Corp.)
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from article Optical microscope
Hanging-drop preparation.
