Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1987-01-23
1988-05-31
Martin, Jr., William D.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33 1PT, 33346, 340689, G01C 906
Patent
active
047472162
ABSTRACT:
A clinometer includes a cyclindrical cavity having a conductive cylindrical wall and a vertical annular wall having a high resistance resistor uniformly distributed thereon. A freely moving, heavy conductive ball seeks the lowest point in the cavity. The conductive ball contacts both the conductive cylindrical wall and a point along the resistor, thereby defining the resistance between a terminal connected to one end of the resistor and another terminal connected to the conductive cylindrical wall. This resistance is a function of the inclination of the clinometer. A reference voltage is applied to the end terminal of the resistor. The terminal connected to the conductive cylindrical wall is coupled to a circuit that converts a voltage across the resistance into a digital voltage that represents the inclination of the clinometer.
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Kelly Madelyn I.
Kelly Vincent M.
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