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Updated: May 17, 2025
To secure the galena crystal in the cup you simply unscrew the knurled cap, place it in the cavity of the post and screw the cap back on again. The free end of the cat-whisker wire is then adjusted so that it will rest lightly on the exposed part of the galena. The Tuning Coil.
This is known as the Rasco baby detector and it is made and sold by the Radio Specialty Company, 96 Park Place, New York City. The base is made of black composition and on it is mounted a standard in which a rod slides and on one end of this there is fixed a hard rubber adjusting knob while the other end carries a thin piece of phosphor-bronze wire, called a cat-whisker.
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