Lynde, Carleton John, b. 1872 · New York, Macmillan · leaf 277
rtual, erect, and reduced. OPTICAL INSTRUMENTS The camera. — The photographic camera, Fig. 192, is simplya light-proof box, with a converging lens L, fixed in an openingon one side and a ground glass screen S at the opposite side.To focus the camera on any object AB, the lens is movedback and forth… … FIG. 192. — The camera. un-covered for a cer-tain time. The projecting lantern. — The projecting lantern consistsof a light-proof box, a source of bright light, a condensing lens,the lantern slide, and a projection lens. A bright light is produced by electricity, or gas, or, as in Fig.I93> by a…
Physics · Home Economics
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