Irregular surface ellipsograph

Details Irregular surface ellipsograph Irregular surface ellipsograph

1991-06-05

1992-06-23

Shoap, Allan N.

Geometrical instruments

Scriber

Curved line

33 301, 33DIG1, B43L 11045

Patent

active

051231719

ABSTRACT:
An apparatus, of a compact pocket-sized design, for the description of accurate ellipses of an infinite number of conjugate and transverse diameters on flat and/or irregular surfaces, such as spherical or horizontal and vertical cylindrical tanks, having two identical, independent focal-point holders, a non-elastic inter-connecting cord and a variety of inter-changeable mounting bases to allow the mounting of the focal-point holders on soft, porous, non-porous, textured and metallic surfaces.

REFERENCES:
patent: 149474 (1874-04-01), Hazen
patent: 758314 (1904-04-01), Hanlon
patent: 768997 (1904-08-01), Johnson
patent: 950696 (1910-03-01), Herman
patent: 1116549 (1914-11-01), Berg
patent: 1188900 (1916-06-01), Clogston et al.
patent: 1230994 (1917-06-01), Caldwell
patent: 1571777 (1926-02-01), Golden
patent: 2667695 (1954-02-01), Price
patent: 2834112 (1958-05-01), Seagraves
patent: 3145477 (1964-08-01), Morrison
patent: 3823478 (1974-07-01), Farmos
patent: 3947968 (1976-04-01), Rosenheck

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