Geometrical instruments – Straightedge type – Base attached
Patent
1978-08-11
1979-10-09
Haroian, Harry N.
Geometrical instruments
Straightedge type
Base attached
33 1N, 33482, B43L 700
Patent
active
041700651
ABSTRACT:
A flat sheet annular ring has a first exterior circular perimeter and a concentric interior circular perimeter. The annular ring has the 360 circular degree compass scale indicia disposed thereon, at least adjacent to the ring interior circular perimeter, with appropriate compass one degree (1.degree.) intervals. A single flat sheet circular inner disc, having a second exterior perimeter, is disposed inside the interior circular perimeter of the ring, having a snug rotatable fit in the ring. The single disc has at least one set of multiple narrow width linear parallel slots disposed through the thickness of the disc. The at least one set of multiple parallel slots are disposed symmetrically about the center of the single inner disc. A center aperture marks the disc center, sized to accept an indicia marker tip. A constant space interval, equivalent to at least a unit of one minute (1") scale distance on a selected scalar sized marine navigation map, separates each one of the multiple parallel slots of the at least one set of slots in the disc from each other and from the center of the inner disc. The width of the parallel slots of the at least one set of slots accepts a pencil point or the like marker. The parallel slots of the at least one set of slots each have a first terminus and a second terminus disposed inside the second exterior perimeter of the inner disc. A compass point indicia is disposed on the disc adjacent to the disc second exterior perimeter and extends across and through the center of the inner disc, and is disposed normal to the parallel slots.
REFERENCES:
patent: D165849 (1952-02-01), Jordan
patent: 2013603 (1935-09-01), Dalton
patent: 2216490 (1940-10-01), Garrett
Haroian Harry N.
Jones J. L.
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