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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 ?
For evaluation purposes, we have carried out relative gravity measurement with the relative spring gravimeter LaCoste&Romberg model G on 8 stations of the network.
In processing data obtained during the relative gravimetric survey, we considered the influence of air pressure, the movement of Poles and short-time gravimeter drift influence.
and Xiaoping, K.: 2006, Wavelet filter analysis of splitting and coupling of seismic normal modes below 1.5 mHz with superconducting gravimeter records after December 26, 2004 Sumatra earthquake.
and Rogowski, J.: 2011, On consistence of seasonal crustal deformation derived from GRACE data and hydrology models and measured by GPS and absolute gravimeter at the Jozefoslaw Observatory in Poland.
It has been set up in the spring of 1993 using concrete pillars with heads for forced centering of satellite antenna and for placing gravimeters during epoch measurements.
The instrumentation of the Geodetic Observatory Pecny was upgraded and extended by the superconducting gravimeter OSG-050, the microwave water vapor radiometer TP/WVP-3000 of Radiometrics Inc., USA and the 3-D very broad-band seismometer GURALP CMG-3TD installed in a deep borehole at the GOP.
However, it will be shown, that such a value represents only the precision of the FG5#215 gravimeter, because it does not reflect many of errors acting during the measurement.
Gravimeter Number Precision Scintrex Autograv CG-5 10125 2.1 [+ or -] 1.1 [micro]Gal LaCoste & Romberg 1068 8.9 [+ or -] 4.2 [micro]Gal The precision in table means an average root mean square error for one measurement in one typical day unit.
The gravity measurements with the relative gravimeter Scintrex CG-5 were carried out in three periods, while the third period was divided in two time intervals:
* metal gravimeter La Coste & Romberg, model G, for which the read-outs were made by the interpolation method with an external volt meter,