Pocket Radio

Engraving prayers on pinheads may be Art for Art's sake, but making smaller & smaller radio transmitters is a matter of convenience and utility. National Broadcasting Co. last week exhibited a three-inch cubical box with slender, demountable, 10-in. antennae projecting on each side. Like the heavier portable sets which it is intended to replace, this pocket transmitter enables an announcer to roam freely at State fairs, golf tournaments, Roller Derbies and train wrecks, ready to broadcast at any instant. Weighing less than a pound, powered by a 90-volt battery which weighs some 3 lb., the set operates on a microwave (about one metre) at 300,000 kilocycles. The signals, which have a range of about four miles, are relayed on ordinary frequency bands by a fixed station.

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