Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 453
cessive light, in flickering light such as that ofa gas-jet, or in unsteady light such as that in a movingvehicle ; and avoid so far as practicable sudden changes oflight, such as lightning flashes, etc. 392. Stereopticon. — This instrument is extensively em-ployed in the lecture-room for producing… … 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…
Physics
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