Hydrostatic plumber's level

Details Hydrostatic plumber's level Hydrostatic plumber's level

1990-12-21

1992-04-07

Will, Thomas B.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

G01C 504

Patent

active

051015714

ABSTRACT:
A vertical-difference measuring instrument comprising an entirely closed liquid system containing, as the only fluid, only substantially noncompressive liquid, the liquid system comprising a variable-volume reference reservoir and a sensing reservoir interconnected by a flexible hose, a flexible-walled gas container in the sensing reservoir and a pressure gauge connected in fluid communication with the flexible-walled gas container in the sensing reservoir for giving indication of the vertical distance between the reference reservoir and the sensing reservoir is disclosed.

REFERENCES:
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patent: 4379367 (1983-04-01), Legris
patent: 4384410 (1983-05-01), Melugin
patent: 4563822 (1986-01-01), Legris
patent: 4581931 (1986-04-01), Robotti et al.
patent: 4651433 (1987-03-01), Mohr
patent: 4759134 (1988-07-01), Chrisley

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