Drawing instrument for an ellipse

Details Drawing instrument for an ellipse Drawing instrument for an ellipse

1978-07-18

1980-01-08

Shepperd, John W.

Geometrical instruments

Scriber

Curved line

33 30R, B43L 1104

Patent

active

041820436

ABSTRACT:
A drawing instrument for drawing an ellipse having two arms extending to left and right associated with operating mechanisms, so that when the arms are opened by a turning force of a first arm, a center moves along the straight line C, C' at a right angle to a straight line B, B' while maintaining two angles .theta. and .theta.', which are formed between the straight lines B, B' extending between centers of the bed seats or supports and left and right arms about the center, equal to each other.

REFERENCES:
patent: 922560 (1909-05-01), Brickey
patent: 1029515 (1912-06-01), Schreiber
patent: 2926423 (1960-03-01), Johnson

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