Acoustic Umbrellas

Wall Art and Photo Gifts from Mary Evans Picture Library

Acoustic Umbrellas

Umbrellas can be used as sound-collecting devices, enabling two people to conduct a whispered conversation without others overhearing

Media ID 4369085

© Mary Evans Picture Library

1921 Acoustic Collecting Conduct Conversation Devices Enabling Experiments Overhearing Sound Umbrellas

MADE IN THE UK
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