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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 ?
Operator consistency in placing the hydrometer into the coating and length of test time are critical.
Tralles: Like the Gay-Lussac scale, the Tralles scale was a hydrometer scale designed for reading percent ethanol by volume.
There is a new digital hydrometer on the way to the fleet that NAVSEA and GNB have tested and approved for taking specific gravity's on the submarine main storage battery.
Refractometers vary in sophistication even more than hydrometers. They range from hand-held models to on-line systems that can provide instant feedback to blenders, valves and other plant machinery.
A similar analysis for the low solids coating showed that the standard deviations for each ranged from 0.519-0.712 (average of 0.609) for the glass hydrometers. The standard deviations for the plastic hydrometers ranged from 0.80-1.30 (average of 1.05).
* AFS 409-87-TS, Specific Gravity of Refractory Coatings: Hydrometer Method (i.e.
After mixing the coating sample thoroughly, immediately float the hydrometer in the coating slurry.