Geometrical instruments – Scriber – Curved line
Patent
1975-04-28
1976-04-06
Aegerter, Richard E.
Geometrical instruments
Scriber
Curved line
B43L 1104
Patent
active
039479684
ABSTRACT:
A device for drawing ellipses comprises a measuring stick formed with a longitudunal slot closed at its ends, a cord having one end fixed to a first point on the measuring stick, a slide movable along the slot to align the indexing point thereof with a second point on the measuring stick, and releasable cord fixing means at the indexing point of a lower section of the slide for fixing a predetermined length of the cord between the slide indexing point and the first-mentioned point of the measuring stick. The first and second points of the measuring stick thus constitute the two focii of the ellipse to be drawn, and the mentioned predetermined length of cord is thus equal to the sum of the distances from the two focii to all points on the ellipse to be drawn.
REFERENCES:
patent: 149474 (1874-04-01), Hazen
patent: 707580 (1902-08-01), Gregory
patent: 768997 (1904-08-01), Johnson
patent: 1488641 (1924-04-01), Johnston
patent: 3224098 (1965-12-01), Terrell
Aegerter Richard E.
Barish Benjamin J.
Phillips Charles E.
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