The Klydonograph is a device that records a surge in electrical voltage on a sulpher-dusted photographic film. The device is credited to John F. Peters, who pursued the idea as a means of investigating the effects of lightning on electric power lines. The resulting graphic varies in size and shape as a function of the potential, polarity, and wave...
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http://en.wikipedia.org/wiki/Klydonograph
a brand name for an instrument that photographically records a surge of voltage, as in a power line.
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https://www.infoplease.com/dictionary/klydonograph
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