Perspective drawing apparatus

Details Perspective drawing apparatus Perspective drawing apparatus

1984-10-29

1986-05-06

Ward, Robert S.

Geometrical instruments

Straightedge type

Base attached

33 2705, 33449, B43L 1314

Patent

active

045862656

ABSTRACT:
A drafting apparatus having a linear edge with first and second wheel means associated with the edge to rotatably move the linear edge across a planar drafting surface and wherein the wheels are of differing diameter so as to have the linear edge move across an arc defined within a circle toward which the linear edge is always pointed. The center of that circle is the vanishing point as conventionally utilized with perspective drawing techniques.

REFERENCES:
patent: 1348655 (1920-08-01), Moore
patent: 1511378 (1924-10-01), Strom
patent: 3195235 (1965-07-01), Regan

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