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Radio Record, Volume III, Issue 40, 17 April 1930, Page 31

Bven his valves were home-made, ag he found where a wholesale drug company dumped its broken test tubes, where the electric light company dumped its burnt-out bulbs, and where he could pick up enough scraps of tungsten wire for his filaments. To exhaust his home-made valves he constructed his own mercury vacuum pump from scrap glass, the necessary mercury being given or lent by another amateur, his headphones were built from bits of wood and wire, and the greatest outlay was. that this lad of 17 had to face was 25 cents for a pair of cutting pliers. It is stated that his station was. pare ticularly efficient and attracted considerable attention on account of his longe distance records and superior operat~ ing.