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no date - suspended between 40 ft. poles for the purpose of measuring the sensitivity of the radio transmitter and receiver

BLACK BOX

E&MP129.003

Telemeter
(should be Subject 134 Television)

no date

Prints 1 and 2 show views of the black box suspended between 40 ft. poles for the purpose of measuring the sensitivity of the radio transmitter and receiver. The black box has been raised and lowered several 100,000 times.

 


Original Caption by Science Service
Science Service



National Museum of American History

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