The Teinograph, a New High-Voltage Surge Recorder

Abstract
An inexpensive new instrument is described in this paper, which records the waveshapes of high-voltage (HV) transients such as lightning or switching surges. The device requires no power supply, cathoderay tube, or photographic film, and can be left unattended for long periods of time. Waveshape is recorded by the envelope of a sequence of Lichtenberg figures on a dielectric plate, and equivalent "sweep-speeds" of less than 5 μsec (microseconds) can be obtained for study of the wavefronts of lightning currents.

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