Apparatus for drawing an ellipse using a piece of string

Details Apparatus for drawing an ellipse using a piece of string Apparatus for drawing an ellipse using a piece of string

1984-06-20

1986-06-17

Martin, Jr., William D.

Geometrical instruments

Scriber

Curved line

B43L 1104

Patent

active

045947848

ABSTRACT:
An arm extends out over the surface on which the ellipse is to be drawn, from a support in the form of a base plate with a handle that can be grasped to hold the support in a desired position. A piece of string is slackly fixed at two space sites along its length to two selected places spaced along the length of the arm of the support. A string-follower is provided in the form of a shaft having an arm radially and rotatably projecting from its lower end. At a site displaced from the shaft, a perforation is provided down through this arm. A drawing instrument is mounted to the string-follower so that its drawing tip underlies the lower opening of the perforation. The string extends down through the perforation to limit to limit the envelope of excursion of the string-follower in drawing an ellipse.

REFERENCES:
patent: 1487044 (1924-03-01), Barach
patent: 1488641 (1924-04-01), Johnston
patent: 2654952 (1953-10-01), Solon
patent: 3947968 (1976-04-01), Rosenheck

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