Apparatus for indicating the angle of a drafting parallel

Details Apparatus for indicating the angle of a drafting parallel Apparatus for indicating the angle of a drafting parallel

1977-11-08

1978-08-15

Haroian, Harry N.

Geometrical instruments

Scriber

Curved line

B43L 1302

Patent

active

041062027

ABSTRACT:
Apparatus for use with a drafting board and a drafting parallel of the type including a straight edge suspended by cables on one surface of the board for parallel movement therealong, comprising means for releasably locking one end of the straight edge in a fixed position relative to the drafting board so as to permit pivotable movement only of the straight edge, an angle scale connected to the board adjacent the other end of the straight edge for indicating the amount of pivotable movement of the straight edge, and a pointer connected to the other end of the straight edge for use in association with the angle scale.

REFERENCES:
patent: 1482606 (1924-02-01), Goldrick
patent: 2627323 (1953-02-01), Larson

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