HANDY HANDSET (Dec, 1962)
Sound-powered telephones make superlative yuletide toys
By HAROLD P. STRAND
SURE THEY WORK—and you don’t even need batteries! What are they? Just a pair of sound-powered telephones that are certain to turn a couple of kids into a pair of happy hooligans for many a fun-time session. And what’s the secret? There really isn’t any— other than the fact that a crystal earphone will work as either an earphone or a microphone, depending on whether you talk or listen. Connect two such units in series, attach them to a suitable support so that you can hold one to your ear and the other to your mouth, and you have the main elements of this setup.
As you can see from the photos and drawings, the handles for the handsets are strips of aluminum which have been bent into the required shape. The bases are made of wood, and almost anything will do for the jacks and connectors. To put the telephones in operation, just connect them together with up to 100 feet of twin or twisted wires, and start talking. Happy holidays!