Gower, H. D, Jast, L. Stanley (Louis Stanley), 1868-1944, Topley, W. W. C. (William Whiteman Carlton), 1886-1944 · New York : Arno Press · leaf 287
cylinder of brown paper held in place by a rubber band. This method, however, is only available when the lens has a “ behind ” or ” between ” shutter. In other cases a cap must be made to fit the projecting card circle. With many shutters working in front of the lens, sufficient pro- tection is… … This may be made of thin wood or card, attached to a collar of cardboard fitting the lens front. The inside must, of course, be blackened.
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten02unit-166-66.webp)
