Apparatus for showing the mechanical equivalent of heat, 1884.

 
Apparatus for showing the mechanical equivalent of heat, 1884.
4 0 c m
 
33cm
actual image size: 25cm x 32cm

Description

This device, invented by the physicist Charles Vernon Boys (1855-1944), gives an accurate figure for the mechanical equivalent of heat. The amount of heat energy needed to raise the temperature of 1kg (2.2lb) of water by one degree is one kilocalorie, or about 4000 joules. This is the same amount of mechanical energy needed to lift a four tonne weight by 10cm.

Image Details

Image Ref.
 
10325941

© Science Museum / Science & Society Picture Library

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