Geometrical instruments – Miscellaneous – Light direction
Patent
1982-12-02
1984-07-17
Stearns, Richard R.
Geometrical instruments
Miscellaneous
Light direction
33174E, G01B 356, G01B 524
Patent
active
044597487
ABSTRACT:
An acute dihedral angle is measured by determining the slope of one plane relative to the other. A base member is disposed on one plane and has a threaded bore which axially extends perpendicular to the one plane. A screw member threadedly engages the base member bore and has a peripheral diameter D. An annular collar member threadedly engages the screw member between the base member and the second plane and has a peripheral diameter D'. The slope between the planes is measured by rotating the screw in the base member and the collar about the screw until the peripheries of both the screw and collar contact the second plane. The tangent of the acute angle between the planes can then be computed as (y'-y)/(D'-D) (1/2), where y' and y are the distances from the first plane to the points of contact at the second plane of the screw and collar, respectively.
REFERENCES:
patent: 1637757 (1927-08-01), Swanson
patent: 2464912 (1949-03-01), White
patent: 2565140 (1951-08-01), Leustig
patent: 2975524 (1961-03-01), Field
patent: 3116560 (1964-01-01), Matthews
patent: 4206548 (1980-06-01), Bergman
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