Drafting parallel bar

Details Drafting parallel bar Drafting parallel bar

1977-06-29

1978-03-14

Haroian, Harry N.

Geometrical instruments

Scriber

Curved line

B43I 1302

Patent

active

040783120

ABSTRACT:
A parallel bar including a base member adapted to be flatly positioned on the surface of a drawing board in overlying relation for movement in opposing directions along guiding cables transversely of the board. The base member is provided with a scale and a slider having a hairline and securable to one of the bar guide cables for indicating increments of movement of the bar with respect to the surface of the drawing board.

REFERENCES:
patent: 2804691 (1957-09-01), Justis
patent: 3892041 (1975-07-01), Adair

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