Word: oscillograph
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Dates: during 1927-1927
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...machine shown in Manhattan was devised by J. W. Legg, inventor for Westinghouse Electric & Mfg. Co., and Dr. Max A. Goldstein, director of Central Institute for the Deaf, St. Louis. In principle it is like the oscillograph used in every high-school physics class for experiments on sound. Noises thrown against a diaphragm causes a light to throw a shadow against a screen. The same sound always causes the same shadow. The Legg-Goldstein machine is a highly efficient oscillograph...