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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.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
In the agency's north region, there were 11 vacancies including two hydrometry posts; a special enforcement assistant; two planning officer roles and a business planning assistant team member - and technical support were not being recruited.
The measure of impedance (or one of its component vectors, resistance and reactance) is usually combined with height, weight, age and/or sex in a regression equation based on comparison with a criterion technique (usually hydrometry or underwater weighing) (5).
Specific gravity is most commonly measured by one of three methods: hydrometry, refractometry, or reagent strip.
Soil pH was determined in a 2:1 water:soil mixture and particle size analysis (percentage sand, silt, and clay) by Bouyocous hydrometry. Loss-on-ignition was determined [TABULAR DATA FOR TABLE 1 OMITTED] by igniting soils at 475 [degrees] C for 2 h, and carbon was determined by wet oxidation and back-titration of the dichromate on two subsamples of 26 sampling occasions X plot combinations, chosen to provide a wide range of values from the LEM and the HEM plots.
But the principles of hydrometry can be applied in some surprisingly sophisticated ways.
Kolupaila (1961) traces the history of hydrometry back to the water supply and irrigation structures in China, India, Babylon, Egypt, and the Roman Empire.
Common laboratory methods include dual-energy X-ray absorptiometry (DXA), densitometry obtained from underwater weighing or air displacement plethysmography, and hydrometry from isotope dilution.