Vacuum demonstration equipment built for King George III, late 18th century.

 
Vacuum demonstration equipment built for King George III, late 18th century.
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

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