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A. F. TURNER air film air-to-glass surface anti-reflection films apparatus Apsley House B&L MICROSCOPE Balopticon Bausch & Lomb cardboard Cinephor color contact printing cover glass Dark field emulsion equipment FIELDS OF ETON film index film reflects flected glass plant glass surface half wavelength images index of refraction instrument John Henry Comstock kid gloves laboratory lantern slide plates lens less difficult light beam light losses light reflected Lomb Optical Company loss of light material ment microscopic objects millimeter Model Newton's Rings nique Onion-thrips opaque objects Optical Glass optical systems due paper Paul Street permanent mounts phase relation photogenic draw photographic photomicrographs plate of glass quarter wave quarter wavelength reduce the reflection reflected beam reflected light reflection loss refractive index Rochester Royal Society silver nitrate solar microscope species specimen square root surface layer teaching thickness thin films thrips collected THYSANOPTERA tion transmission films transparency Wedgwood Wedgwood's experiments wings