Geometrical instruments – Area integrators – Electrical
Patent
1982-03-02
1983-11-22
Little, Willis
Geometrical instruments
Area integrators
Electrical
33143R, 33154F, G01B 514
Patent
active
044160631
ABSTRACT:
A proportional divider comprises a reference index located between a pair of variable indices and a sectionalized threaded spindle having opposite end sections with reverse threads and of different pitches in a ratio approximating 1 to 0.618. Each spindle section threadingly engages a support for one of the variable indices whereby rotation of the spindle simultaneously adjusts the distances between each variable index and the reference, the distances being maintained in said ratio which is known as the "golden proportion". In one form of divider, the supports for the variable indices are retained for movement along a straight track, the reference and variable indices being portions of pointers extending perpendicularly to the track, the reference pointer being fixed and the variable pointers being mounted on said supports. A plurality of interchangeable reference pointers and variable pointers provide versatility to the divider. In another form of divider, a pair of legs pivoted at one end serve as the supports and mount the variable indices at the free ends thereof. The legs and spindle, which controls the separation of the legs, are all coplanar. The reference index is supported for movement along a reference axis parallel to but spaced from the plane of the legs.
REFERENCES:
patent: 1201342 (1916-10-01), Peck
patent: 1280379 (1918-10-01), Bonney
patent: 1303471 (1919-05-01), Gross
patent: 1667562 (1928-04-01), Neubauer
patent: 2547354 (1951-04-01), Worden
patent: 2559280 (1951-07-01), Cochran
patent: 3026624 (1962-03-01), Clay
patent: 3151398 (1964-10-01), Torrey
Nestor Jack
Shoemaker, Jr. William A.
Barnett Erwin M.
Little Willis
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