Tiny Tube for Hearing Aids (Feb, 1947)

This tube is about the same size as an entire modern hearing aid.

Tiny Tube for Hearing Aids

Only 3/4-inch long and 3/8-inch wide, tubes like this powered such war devices as walkie-talkies and mine detectors. Now their maker, Sonotone, is using them in hearing devices. Three of them go into Sonotone’s latest instrument, which can be used for either low- or high-powered amplification.

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3. Builds Giant Television Tube (Apr, 1938)
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5. Atomic Force Measured In Giant Electronic Test Tube (Jun, 1936)