Acoustic Umbrellas
Umbrellas can be used as sound-collecting devices, enabling two people to conduct a whispered conversation without others overhearing
Picture No
10193587
Media ID
47436448
Size
4626px x 2968px
(2.1MB)
Credit
Mary Evans Picture Library
Source
Liebig card in series 1116 Curieuses experiences de physique' issued in 1921 1 of 6
Date
1921
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Acoustic Collecting Conduct Devices Enabling Experiments Overhearing Umbrellas Whispered
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