Graphics protractor

Details Graphics protractor Graphics protractor

1985-10-11

1986-12-02

Stearns, Richard R.

Geometrical instruments

Miscellaneous

Light direction

33471, B43L 706

Patent

active

046254099

ABSTRACT:
A graphics protractor (10) for placement on a computer display screen (52) to determine direction changes for graphics commands has a circular ring (12) bearing indicia (14) representing relative angles with respect to a point (16) of origin on the ring (12). First and second sheets (18,20) through which display screen (52) is visible are rotatable with respect to the ring (12). The sheets (18,20) each have a straight line (44) movable into and out of registration with respect to the straight line (44) of the other sheet (20,18) by rotation of the sheets (18,20) within the ring (12). The sheets (18,20) have a graphics symbol (28) centrally located with respect to the ring (12), which is placed over a corresponding graphics symbol (50) on the computer display screen (52) to use the protractor (10).

REFERENCES:
patent: 2235177 (1941-03-01), Stark
patent: 2364731 (1944-12-01), Luck
patent: 2424065 (1947-07-01), Stewart
patent: 2480914 (1949-09-01), Gallington et al.
patent: 2602228 (1952-07-01), Webber
patent: 3844042 (1974-10-01), Hodge
patent: 3925899 (1975-12-01), Hesse et al.
patent: 4454654 (1984-06-01), Mayer

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