Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 65
cs and Chemistry ofThe Franklin Institute held Thursday, December 8, 1921, 49 50 E. A. ECKHARDT. [J. F. I. If long films are to be used one has the choice of unrolling thefilm from one small drum on to another during the exposure inter-val, or of using a single drum of sufficiently large… … The high-speed oscillograph camera. large drum, on the other hand, can be brought up to speed priorto the exposure. Conditions are, therefore, favorable for uniformmotion of the film at high speeds. The shutter mechanism, how-ever, in this case must operate with precision, so as to avoiddouble…
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