The optical lantern, for instruction and amusement (1890)
Pringle, Andrew · New York, The Scovill & Adams Company · leaf 77
ed by shortening and lengthening the front and rear straps respectively, and the frame works freely in the holes made for the purpose in the base cross-pieces, so that any tilt can be obtained in an instant. Fig. 33. There are various methods of mounting a screen on its frame in a hall preparatory… … to tie the screen by its tapes to these lengths, and then to join on the next lower poles, tying the screen to these in their turn till the whole is erected. By means of the bottom tapes, and those within reach with or without a ladder, the whole fabric is finally made taut. With a large screen we…
Lantern projection
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
