point, well under 200 F, such as Wood's metal is used. One surface is left exposed to allow contact with the cat-whisker wire.

Cat whisker wire

Phosphor bronze wire of about 30 AWG (0.25 mm) diameter was commonly used as a cat whisker because it had the right amount of springiness. It was mounted on an adjustable arm with an insulated handle so that the entire exposed surface of the crystal could be

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