SHARMAN PIPE OR CABLE FAULT LOCATOR, 1914
Patents 16799 15th July 1914 and 24056 15th Dec 1914 accredited this item to Alexander William Sharman, holder of 40 other electrical and scientific patents.
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A transformer like search probe for locating breaks in metal pipes and cables which would be connected to the oscillator output (red lead) while the negative lead is connected to a metal stake which is driven into the ground to provide a return circuit. Headphones can be connected to the search probe or to the accessory search coil.