Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1990-10-01
1991-04-16
Haroian, Harry N.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33343, G01C 920
Patent
active
050071769
ABSTRACT:
An instrument for measuring angles, vertical line or horizontal line includes a square casing having two axial lines crossing at a center of the casing and having a colored liquid filled in the casing, and a rotating disc rotatably mounted on the casing, in which the rotating disc is formed with an upper half circle portion radially formed with a plurality of angular graduations in terms of degrees, and formed with a lower half circle portion having two vertical columns parallelly formed below a diametrical line dividing the two half circle portions, and at least a reference line linked between any two horizontal graduations respectively formed in the two vertical columns, whereby upon a rotation of the disc to parallel the reference line to a liquid level of the colored liquid, an angle can be obtained by matching the angular graduation with any one axial line when the casing is laid on or coincided with a plane to be measured.
REFERENCES:
patent: 2541215 (1951-02-01), Davis
patent: 2584917 (1952-02-01), Powell
patent: 3699661 (1972-10-01), Baltz
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