Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 361
ogether with their axesparallel, an enlarged image of distant objects will beproduced in each eye. Such an apparatus is the ordinaryopera-glass of to-day. 577. The Optical Lantern. — The projection or opticallantern is an apparatus for projecting on a screen an en-larged image of an object without… … Fig. 226. the increase in brightness is produced by placing the objectin front of a powerful light, such as the ordinary arc light,and allowing the transmitted light to fall upon the screen;while the enlargement is produced by placing the screenupon which the image falls a considerable distance…
Physics
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