Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1986-11-26
1988-07-26
Martin, Jr., William D.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
G01C 504
Patent
active
047591340
ABSTRACT:
A leveling instrument is provided with a flexible length of tubing extruded with a pair of thin-walled, balloon-like diaphragms at opposite ends thereof. The tubing contains a flow passage filled with liquid in communication with atmospheric pressure acting upon the liquid through the diaphragms. The liquid provides a leveling medium for the instruments for establishing the level of one location with respect to another location. A method of manufacturing the leveling instrument is also disclosed.
REFERENCES:
patent: 762072 (1904-06-01), Lord
patent: 915084 (1909-03-01), Eberhard
patent: 3842513 (1974-10-01), Clark
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