The optical lantern, for instruction and amusement (1890)
Pringle, Andrew · New York, The Scovill & Adams Company · leaf 113
membered, must be kept from the sensitive material as sedulously as direct stray light. The paper or other sensitive material is to be placed in front of the projection lens, and the receiving surface must be perpendicular to the optical axis of the condensing and projection systems. If this is not… … Fig. 46. may be free on the floor, but it is better when convenient to have it either running on a track or sliding in slots or grooves along the optical axis of the system. Fig. 46 shows a very useful easel made to hold a long roll of bromide paper or cut sheets,- as may be desired. The accurate…
Lantern projection
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
