Measuring and testing – Specific gravity or density of liquid or solid
Patent
1980-02-06
1981-07-14
Gill, James J.
Measuring and testing
Specific gravity or density of liquid or solid
73433, G01N 908, G01N 922
Patent
active
042779707
ABSTRACT:
Apparatus and method for specific gravity measurement of an object having a known geometry and weight is provided which is particularly adaptable for determining the specific gravity of a gemstone. The apparatus includes a fluid circuit and a pump therefor with the fluid circuit having an adjustable fluid flow rate. The fluid circuit also includes a test chamber element for receiving the object and a flow measuring element for determining fluid flow rate. Preferably, the test chamber is vertically oriented and has zones of decreasing fluid velocity from its lower to upper ends for a constant fluid flow rate through the circuit. The method of measurement is made in one of two modes. In one mode, the flow rate is held constant so that the vertical position of the object of unknown specific gravity in the test chamber yields data allowing calculation of its specific gravity. In the second mode, the fluid flow rate is adjusted so that the object attains an equilibrium position at a pre-selected location in the test chamber and the fluid velocity at that point is then determined by measuring the flow rate through the fluid circuit and the specific gravity is thereby calculated.
REFERENCES:
patent: 2348733 (1944-05-01), Fischer
patent: 2800019 (1957-07-01), Rumble
Dawson Gregg W.
Dawson Paul R.
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