Protractor

Details Protractor Protractor

1980-11-17

1982-11-16

Haroian, Harry N.

Geometrical instruments

Straightedge type

Square and pivoted straightedge

33 1N, 33499, B43L 706, B43L 1308

Patent

active

043588980

ABSTRACT:
A protractor consisting of a flat base having two straight edges and a degree scale, a measuring arm mounted on the base for rotation about a pivot point and having straight edges for cooperating with the straight edges of the base to form angles corresponding to angles to be measured, an indicator arm mounted on the measuring arm for rotation about the pivot point, and having an indicator mark, and locking means for fixing the indicator arm in plurality of predetermined positions on the measuring arm so that, in each position, the angle indicated by the mark on the scale coincides with the angle formed between one of the straight edges of the base and one of the straight edges of the measuring arm.

REFERENCES:
patent: 655005 (1900-07-01), Penfield
patent: 1292957 (1919-12-01), Maddox
patent: 1774731 (1930-09-01), Sjobring
patent: 2361807 (1944-10-01), Wolfe
patent: 2578077 (1951-12-01), McKnight
patent: 2689406 (1953-01-01), Stromquist
patent: 2920392 (1960-01-01), Stromquist
patent: 2959861 (1960-11-01), Stromquist

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