Page:Wireless Telegraphy and Telephony (1908, Massie and Underhill).djvu/43

the telephone receiver produces sound, as already described.

The platinum wire employed in the electrolytic detector

Fig. 16.—Silicon Detector.

is so fine, and the method of its manufacture so unique, that we here describe it.

A heavy platinum wire approximately one one-hundredth of an inch in diameter is coated with a suitable thickness of silver. The combined silver and platinum wire is then drawn down to the desired diameter. The close-fitting silver jacket prevents the rupturing of the