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HYDROMETER. An instrument for measuring the density of fluids; being immersed in fluids, as in water, brine, beer, brandy, &c., it determines the proportion of their densities, or their specific gravities, and thence their qualities.
     2. By, the Act of Congress of January 12, 1825, 3 Story's' Laws U. S. 1976, the secretary of the treasury is authorized, under the direction of the president of the United States, to adopt and substitute such hydrometer as he may deem best calculated to promote the public interest, in lieu of that now prescribed by law, for the purpose of ascertaining the proof of liquors; and that after such adoption and substitution, the duties imposed by law upon distilled spirits shall be levied, collected and paid, according to the proof ascertained by any hydrometer so substituted and adopted.

References in periodicals archive ?
Gounden and Newall (1983) conducted a study using urine from 12 adults to test the relationship between urine specific gravity measured by hydrometry, reagent strip, and refractometer.
No matter how sophisticated hydrometry gets, however, it essentially remains dependent on batch sampling: It's impossible to measure a moving stream by a method that depends on floating.
Kolupaila (1961) traces the history of hydrometry back to the water supply and irrigation structures in China, India, Babylon, Egypt, and the Roman Empire.