The detector shown in Figure 212 is of the type often termed a "cat-whisker," because of the long, fine wire resting on the mineral.
It consists of a small clip, formed by bending a strip of sheet-brass, which grips a piece of galena.
A Double Slider Tuning Coil.
A Junior Loose Coupler.
Crystal Detectors.
Galena may be obtained from any dealer in radio supplies. A piece of No. 30 phosphor bronze wire is soldered to the end of a short length of brass rod supported by a binding post. The other end of the rod is fitted with an electrose knob. This part of the detector is called the "feeler."