Geometrical instruments – Area integrators – Electrical
Patent
1986-04-10
1987-12-15
Martin, Jr., William D.
Geometrical instruments
Area integrators
Electrical
73300, G01B 302
Patent
active
047123052
ABSTRACT:
A device is disclosed for measuring the change in the freeboard of a barge, indicating a varying amount of cargo within the barge. An oil gauging tape is used to lower the device which comprises a vertical pipe transversed by a horizontal bar with an aperture therethrough. A flexible tube is coupled to a nipple which is secured to the underside of the block. Water, entering through the tube, flows into the vertical pipe and contacts and changes the color of a chalk or water-seeking paste material lightly spread on the graduated area of a gauging stick, resting in the vertical pipe. The device is lowered until the horizontal bar is submerged approximately 3" below the apparent surface of the water and the oil gauging tape is read for a measurement. The device is held steady to ensure that the vertical pipe is filled to the outside water level and is then reeled to the deck where the gauging stick is removed and the measurement of the water mark is noted and added to the measurement on the oil gauging tape. The sum of the two measurements provide the accurate freeboard reading.
REFERENCES:
patent: 327726 (1885-10-01), Schoening
patent: 1478288 (1923-12-01), MacGregor
patent: 2210775 (1940-08-01), Perry
patent: 3396470 (1968-08-01), Wood
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