Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 633
of the frame are provided with hinged sheetiron doors. The lower part of the lantern frame is providedwith hinged removable doors, which may be used to close inthe hght. 6io EXPERIMENTAL SCIENXE. The front is furnished with a plate hinged to swing in avertical plane, and provided with a cell for… … %ei>\^,.. Scientific Lantern. condenser. The inner lens of the condenser is a plano-convex, 4 inches in diameter and of 8 inch focus, arrangedwith its plane side toward the light. The two outer lensesare plano-convex, 5 inches in diameter and 8 inches focus,arranged with the convex faces…
Physics · Lantern projection · Electric apparatus and appliances
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![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer01inte-174-72.webp)
