Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 66
ide. It ismounted on a shaft, both ends of which protrude from a light- July, IQ22.] Ax Oscillograph Camera. 51 tight housing which in all dimensions, save its width, is just largeenough to accommodate the drum without interference. The widthof the housing is somewhat over eight inches, so that… … The camera set up to obtain oscillogram of loud-speaking telephone diaphragm motion. axial as well as a rotational motion, the oscillograph record istraced on the film as a spiral band, similar to a screw thread.By moving the drum axially one-half inch per revolution andexposing the film through a…
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