Standard parallel rule with perspective drawing device

Details Standard parallel rule with perspective drawing device Standard parallel rule with perspective drawing device

1977-09-01

1979-02-06

Phillips, Charles E.

Geometrical instruments

Scriber

Curved line

B43L 1314

Patent

active

041376358

ABSTRACT:
A standard draftsman's parallel bar or rule is adapted to draw perspective lines by an auxiliary cable and differential pulley system which when detached allows conventional parallel operation.

REFERENCES:
patent: 1964198 (1934-06-01), Edison
patent: 2184718 (1939-12-01), Lopez
patent: 2590252 (1952-03-01), Horst et al.
patent: 3783519 (1974-01-01), Sartori

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