Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 68
rhaps of the safe light),the opening of the housing, the putting of the film in place, andthe closing of the housing. The camera is then ready for use,and the lights may be turned on until the exposed film is to beremoved for development. If the work for which the camera is to be used is being… … Film clamping device. Film ready to clamp. With the loaded camera in position before the oscillograph thedrum is brought to the desired speed. The exposure is begunby operating the relay Rn. Its operation energizes the wheel-gripping and shutter-opening electromagnets simultaneously, sincetheir…
Science · Technology · Meteorology · Patents
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
