The optical lantern, for instruction and amusement (1890)
Pringle, Andrew · New York, The Scovill & Adams Company · leaf 30
20 THE OPTICAL LANTERN. opticians, of whom we may mention Mr. Dallmeyer, of Lon- don, and Messrs. Taylor and Hobson, of Leicester. "We are enabled to give a diagram of a lens by the latter firm, we have worked one of eight inches focus made on these lines and it leaves nothing to be desired. … Fig. 10 (b). Fig. 10 (a). Some remarks as to the focal length of the projection lens seem to be called for. Given a certain distance from lens to screen the shorter the focns of the lens the larger will be the disc on the screen. Given a certain lens the nearer it is to the screen the smaller the…
Lantern projection
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
