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The substance whose specific gravity is to be determined is
now placed on the upper pan and the rider weights employed
as described above until the equilibrium is restored. The
reading obtained now represents the weight 'in air'. The
substance, presumably in pieces, is now transferred from
the upper to the lower pan. In the case of a powdered
substance, the pans could be substituted. The riders or
weights are again adjusted in the usual way and the
resultant reading gives the weight of the substance in water.
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This
method combines accuracy with reasonable rapidity, and is used with
small stones, whose specific gravity does not exceed the maximum
specific gravity of the liquids used.
26
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