Instrument for making perspective drawing

Details Instrument for making perspective drawing Instrument for making perspective drawing

1976-09-28

1978-02-28

Aegerter, Richard E.

Geometrical instruments

Scriber

Curved line

B43L 1314

Patent

active

040757625

ABSTRACT:
An instrument adapted for making perspective drawing, comprising a slider on a base plate and a link pivoted to two levers of exactly equal lengths between pivot centers and at equal distances on the slider and the link. The arrangement further includes a ruler or bar extending in a direction generally transversely to the levers and connected thereto by means of a joint structure which is slidable along the levers to any desired set position and which permits a rotational as well as a sliding motion of the ruler relative to the joint center as the angular position of the ruler relative to the levers is changed.

REFERENCES:
patent: 1794648 (1931-03-01), Shattow
patent: 1807237 (1931-05-01), DePostels
patent: 2874474 (1959-02-01), Beebe et al.
patent: 3332152 (1967-07-01), Dru
patent: 3441322 (1969-04-01), Leschinger
patent: 3718975 (1973-03-01), Ross

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