
4 0 c m
33cm
actual image size: 25cm x 32cm
Description
This demonstration equipment consists of a bell jar containing a clockwork bras bell with two hammers. It was used to show that when the air was removed from the jar with a pump, the sound of the bell became fainter. In a container where the air is compresed, the bell remains audible but the hammer strokes slow down. King George III took a keen interest in science and 'natural philosophy' and owned a large collection of scientific instruments from which this model is taken.
Image Details
Image Ref.
10321276
© Science Museum / Science & Society Picture Library