Two specific gravity jars, 1752.
4 0 c m
 
34cm
actual image size: 26cm x 32cm

Two specific gravity jars, 1752.

© Science Museum / Science & Society Picture Library

Description

These two jars were used by Dr Stephen Demainbray (1710-1782), a scientific lecturer of the 18th century, to compare the different specific gravities of various types of wood. Cylinders of the wood were immersed in water in the jars and shown to sink to different depths.
 

Image Ref.

10190828
 

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