Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 352
list an instru-ment which differs in some respects from others. The prin-cipal feature is the plate-changing device, which is quite PHOTOGRAPHY. 329 simple and admits of the use of flexible bags for holding theplates before and after exposure. The bags—which holdone plate each—are made of the stout… … A Pocket Camera. thin, tough pasteboard. The bags are made over a woodenform. A dozen filled bags occupy very little more roomthan the plates in the original package. The light is ex-cluded, and the plates are held in the bags by folding overthe top, as shown in the engraving. Each bag is…
Physics · Lantern projection · Electric apparatus and appliances
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