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Virtual Science Museum


This is a U.S. Army transceiver model BC-312-N, made by Farnsworth Television and Radio Corporation. It uses valves throughout and covers the short wave bands.

Click the image for a bigger picture.

This is a nicely made plug-in tuning coil from an early radio receiver. On the label is printed, 'De Forest 300 Pat 141344 What are the wild waves saying'. Lee de Forest invented the Audion triode in 1907.

This is a rather nice little crystal set with a germanium crystal and cat's whisker.

The crystal is inside the glass tube. The handle adjusts the cats whisker, which is a piece of wire, sprung against the crystal. With careful adjustment, a 'sweet spot' can be found. The crystal then acts as a diode detector, demodulating the radio signal.

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