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Type 7

 
    
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This exhibit has lost its base down the years, but the envelope is still intact.
The device is a bolometer or a thermocouple. Such devices would have been used to measure the mean power of a non sinusoidal signal. This would have been the heart of an RF power meter.
The balloon envelope is 60 mm in diameter and the overall length is 120 mm.
Reference: Observation.

 

Updated October 01, 2013.
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