Drafting instrument for perspective drawing and other uses

Details Drafting instrument for perspective drawing and other uses Drafting instrument for perspective drawing and other uses

1978-03-09

1980-06-03

Phillips, Charles E.

Geometrical instruments

Area integrators

Electrical

33 27C, G01B 308

Patent

active

042054508

ABSTRACT:
To draw lines in a direction leading to a point it is necessary to locate the ruling edge of a common ruler or straight-edge on the fixed point each time such a thin line is drawn, and in the case of thick lines care has to be taken to put the ruling edge away from the fixed point by a distance equal to one-half the thickness of the line to be drawn.
When the fixed point is a comparatively long distance away necessitating the manipulation of a long and hence cumbersome straight-edge, the process becomes tedious and laborious and tends to lack in accuracy.
The invented ruler with its telescopic and rotating action combined with its aligning device is intended to facilitate the accurate and quick drawing of such lines.

REFERENCES:
patent: 909068 (1909-01-01), Denman et al.
patent: 1288556 (1918-12-01), Gasstrom
patent: 1299627 (1919-04-01), Simon
patent: 1629829 (1927-05-01), Linn
patent: 2245646 (1941-06-01), Bullivant
patent: 3492737 (1970-02-01), Swanson

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