Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1977-09-28
1979-03-27
Phillips, Charles E.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
G01C 504
Patent
active
041458176
ABSTRACT:
Apparatus for determining the difference in height between two widely spaced apart locations utilizes a length of hose filled with fluid. A pressure transducer is secured to each opposite end of the hose in a position to be influenced by fluid pressure incidental to the hose ends being disposed one at each of the locations. The transducers are electrically connected to a source of power and to instruments which cooperate to provide an indication of the difference in elevation between the two locations.
REFERENCES:
patent: 2532883 (1950-12-01), Bennett et al.
patent: 2557021 (1951-06-01), Williams
patent: 3269023 (1966-08-01), Calkins
patent: 3645135 (1972-02-01), Hadley
patent: 4026156 (1977-05-01), Bowditch et al.
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