Noise gun designed to check the sensitivity of microphones.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...n_fullsize.jpg
Previously:
Water pressure microphone - photo
Enormous megaphone from silent film era - photo
Noise gun designed to check the sensitivity of microphones.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...n_fullsize.jpg
Previously:
Water pressure microphone - photo
Enormous megaphone from silent film era - photo
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