Geometrical instruments – Indicator of direction of force traversing natural media – With viewing aid
Patent
1988-10-19
1990-04-03
Shoap, Allan N.
Geometrical instruments
Indicator of direction of force traversing natural media
With viewing aid
33379, 33381, 33382, 33390, G01C 926, G01C 932, G01C 934
Patent
active
049128540
ABSTRACT:
The liquid indicating leveling device consists of a modular unit having four walls each at 90.degree. to one another, the inside surfaces of the walls having a flat non-reflective white surface together with a white back wall and having an open viewing front defining a viewing chamber. The bubble vial is disposed in the viewing chamber parallel to the bottom wall of the viewing chamber so that the vial may be viewed through the open front for both vertical and horizontal leveling. Illumination is provided for selectively maintaining the light level within the viewing chamber at a level sufficiently above ambient for taking a bubble reading without glare or reflections from outside elements. A beam is provided in which the modular unit is mounted to increase the accuracy of the unit over a greater length for more accurate readings. A cross bubble device is provided for taking both vertical and horizontal readings. The beam into which the modular unit is mounted for measuring the level of a plane having a length greater than the length of the modular unit.
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Gutierrez Diego F. F.
Shoap Allan N.
Theibault A. Robert
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