4 0 c m
30cm
actual image size: 22cm x 32cm
Description
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.
Image Details
Image Ref.
10191723
© Science Museum / Science & Society Picture Library