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Updated: May 17, 2025
Upon those principles are made two kinds of areometers one for fluids denser than water; the other for those that are lighter: the first are called salt proof; the second spirit proof.
An areometer, to be good, must be proved with distilled water, at the temperature of 55°. Areometers, being made of glass, are brittle, and must be used with great care. This inconvenience might be remedied, by making them of silver; I have seen several of this metal.
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