Dark matter remains one of science's greatest mysteries, possibly making up 85% of all matter in the universe. Despite decades of research, its exact nature is unknown. One leading candidate to ...

A staple of starting off in electronics ion years past was the crystal set radio, an extremely simple AM radio receiver with little more than a tuned circuit and a point contact diode as its ...

Marked: "Marconi's Wireless Telegraph Co., Ltd. / No. 180014 - London." Instrument is designed to receive code signals in the wavelength range of 200-2500 meters. Aerial tuning inductance normally ...

Gecophone crystal detector radio set no. 1, complete with instruction handbook, made by the General Electric Company Limited, British, 1923. Polished mahogany case with a lift up lid and ebonite ...

Stamped: "Detector / Type A / No. W145 / DR. No. RW 50 A 133 A / W.N.Y. 1916". A three turret crystal detector with a 4-position sweep switch, two connecting screws ...