Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1986-07-07
1987-08-18
Stearns, Richard R.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
G01C 504, G01C 922
Patent
active
046867732
ABSTRACT:
A structure leveling sytem comprises a plurality of portable members each including a base having a bottom and a transparent tube open at its having a bottom and a transparent tube open at its top and upstanding from the base and provided with graduations at intervals along its length. The graduations on all tubes correspond, whereby like graduations on the tubes denote identical distances above the bottoms of the bases. The system also comprises flexible tubing interconnecting the bottoms of the tubes with each other. Liquid, such as water, is introduced into the system through the top of one of the tubes and the structure to be leveled in manipulated until the liquid level in all tubes is at corresponding graduations, thus denoting that the bottoms of the bases are at a common elevation and hence that the structure is level.
REFERENCES:
patent: 386924 (1888-07-01), Kegel
patent: 451680 (1891-05-01), Gamble
patent: 915084 (1909-03-01), Eberhard
patent: 2532883 (1950-12-01), Bennett et al.
patent: 3015167 (1962-01-01), Chapman
patent: 3132428 (1964-05-01), Haissig et al.
patent: 3310880 (1967-03-01), Watts
patent: 3680216 (1972-08-01), Hallanger
Baxley Charles E.
Stearns Richard R.
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