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Blowing out the light

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Under the above caption, the I.E.S. Transactions for October describes a new device called “breath relay,” which consists of special contacts mounted in a small tube with a mouthpiece like that of a telephone, and is so designed that it responds only to a puff of air. Speaking into it, shaking it, or striking it has no effect.

Published in:

Journal of the A.I.E.E.  (Volume:49 ,  Issue: 12 )