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Bell in vacuo demonstration, 1761.

Bell in vacuo demonstration, 1761.
4 0 c m
actual image size: 22cm x 32cm


Vacuum demonstration equipment built for King George III by his instrument maker, George Adams, in 1761. The clockwork bell rings inside a bell jar from which the air is taken out using the air pump. As the air is removed, the bell becomes inaudible.

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