DENSITY AND SPECIFIC GRAVITY

99

der containing the liquid is then brought under the beam in
such a position as to allow the plummet to be totally immersed
in the liquid. Weights are then placed on the beam to bring the
balance again into adjustment. These weights are so related to
the volume of the plummet and to the graduations on the beam

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fig. 26.—Westphal specific gravity balance.
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as to give directly the specific gravity at 75*    Usually the dis-
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placement of the plummet in pure water at the rated temperature
is 5 gm and the figure on the beam directly over the plummet
is 10. Therefore the largest weight piece should weigh 5 gm.