Gage, Alfred P. (Alfred Payson), 1836-1903, Fessenden, C · Toronto : W.J. Gage · leaf 393
§ 319. Stereopticon.—This instrument is extensively em-ployid in the lecture-room for prwiucing on a screen magnifiedinuigos of small transparent pictures on glass, called slides;also for rendering a certain class of experiments visible to alarge audience by projecting them on a screen. The light…
Physics
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