Geometrical instruments – Straight-line light ray type – With straight edge instrument or chart
Patent
1975-09-15
1976-11-02
Martin, Jr., William D.
Geometrical instruments
Straight-line light ray type
With straight edge instrument or chart
33 1K, G01C 300
Patent
active
039888380
ABSTRACT:
A device for enabling an artist to achieve correct proportions when drawing to a different scale than that of the object being reproduced. The device employs a flat transparent elongated plate having two parallel sides of unequal length, one straight and interconnecting these sides and being perpendicular to both sides, the opposite end being curved and interconnecting the two sides while being perpendicular to neither side. An elongated rectangular flat transparent arm lies in a plane parallel to the plate and adjacent to the plate and adjacent one major surface of the plate, one end of the arm being pivotally secured to the plate adjacent the straight end and longer side, the other end of the arm extending past the curved end of the plate. The curved end defines the arc of a circle centered at the point of pivot of the arm. Clamping means on the other end of the plate can be manually operated to clamp the arm to the curved edge of the plate in any desired position thereacross. A transparent slide adjacent the opposite major surface is supported on the sides of the plate, the slide being manually slidable back and forth longitudinally on the plate.
REFERENCES:
patent: 1145050 (1915-07-01), Yates
patent: 1605979 (1926-11-01), Pacioni
Martin, Jr. William D.
The Raymond Lee Organization Inc.
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