Two specific gravity jars, 1752.

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


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.

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© Science Museum / Science & Society Picture Library

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