Word: oscillographs
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Dates: during 1920-1929
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...Name the use of the following: Gal vanometer, vernier, oscillograph, pantograph, micrometer, pyrometer...
Died. Joseph Willard Legg, 41, famed expert in oscillography (wave phenomena), inventor of the osiso (portable oscillograph) and the polar high-speed camera. Westinghouse associate; of pneumonia; in Wilkinsburg, Pa. With his camera, which takes 3,000 pictures a second, Inventor Legg discovered that lightning flashes are a series of complex spirals...
Despite its brevity, the life line of the lightning flash has been accurately measured by the cathode ray oscillograph. This is an instrument developed by the General Electric Company at Schenectady and makes use of a beam of electrons which, acting as a pointer, measures- the rise & fall, or wave shape of the voltages. When a wave of lightning encounters an obstruction it builds up to twice its power, just as a wave of water breaking on a wall will splash about twice its height. Therefore a direct voltage of 3,000,000 traveling along a line will suddenly jump...
...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...