Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 454
Fl6. 330. >For useful information relating to the operation of projection, especially forscientific illustrations, see Wrights Light, and Dolbears Art of Projecting. STEREOPTICON. 433 light is most commonly used, though the electric light is -pre-ferred for a certain class of projections. The… … Fig. 331. from the lime are condensed, by means of a convex lens c,called the condensing lens, (usually two plano-convex lensesare used), so that a larger quantity of radiations will passthrough the convex lens E, called the projecting lens. Thelatter lens produces (or projects) a real, inverted,…
Physics
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