Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1992-01-22
1992-10-27
Haroian, Harry N.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33390, G01C 910, G01C 936
Patent
active
051578425
ABSTRACT:
Briefly stated, the present invention provides a level with a ball rolling on inclined surfaces, the level comprising a window through which the ball can be observed. Reference marks are positioned on the window so as to indicate the horizontal and/or vertical positions of a reference line visible through the window. The level has two spaced transparent lenses or glasses between which the rolling ball is disposed. These can be flat or convex; and if convex, a centrally located reference mark can be provided which indicates the inclination of a surface on which the level rests on its side, that is, with the line of sight through the lenses disposed vertically. This same reference mark, when the lenses are not convex but rather flat, can serve as a target mark for helping to aim the level. In a preferred embodiment, the level has a frame which is square, and the arcuate surfaces are inwardly concave and have a radius of curvature substantially greater than the greatest distance from the concave surface to the center of the level, so that the four concave surfaces meet in obtuse angles adjacent the corners of the level. When this embodiment is also provided with convex lenses, then the level can rest on either major face thereof or on any of the four sides of the level, to provide an indication of the true vertical and/or horizontal in any of the six possible orthogonally oriented positions thereof.
REFERENCES:
patent: 1361367 (1920-12-01), Coxey
patent: 2305678 (1942-12-01), Cravaritis et al.
patent: 2568143 (1951-09-01), Casper
patent: 2826823 (1958-03-01), Hagner
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