Geometrical instruments – Scriber – Curved line
Patent
1978-03-15
1978-12-19
Haroian, Harry N.
Geometrical instruments
Scriber
Curved line
B43L 904
Patent
active
041299485
ABSTRACT:
A unique "compass" device for drawing and measuring circles, and employing a template with a center pin and many holes. Indicia are provided on the template to indicate concentric and generally annular zones centered at a certain center, each such zone having its boundary relatively adjacent the center located a first distance from the center (on the particular distance scale employed on the compass), and also having its boundary relatively remote from the center located a second and higher distance from the center on such distance scale. The holes lie along an Archimedes spiral centered at the center, and all holes located a first perdetermined fraction of each whole number (of the particular distance scale) are disposed along one radial line extending from the center; all the holes located a second and next-higher predetermined fraction of each whole number of the particular distance scale are disposed along a second radial line, etc.
REFERENCES:
patent: 555287 (1896-02-01), Horrigan
patent: 893085 (1908-07-01), Loughborough
patent: 1154673 (1915-09-01), Van Ness
patent: 1266010 (1918-05-01), Golden
patent: 2542537 (1951-02-01), Klemm
patent: 2958132 (1960-11-01), Hartbauer et al.
patent: 3465445 (1969-09-01), Fisher
patent: 3795053 (1974-03-01), Burke
"Floating Triangles," by J. R. Cassell Co. Inc., 9/1946.
Hatter Edward E.
Taylor Richard H.
Gausewitz Richard L.
Haroian Harry N.
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