Geometrical instruments – Straightedge type – Base attached
Patent
1987-05-12
1989-02-07
Martin, Jr., William D.
Geometrical instruments
Straightedge type
Base attached
33 1SD, 33 1LE, G01C 2120
Patent
active
048022837
ABSTRACT:
A navigation device comprises a flat substrate, a compass rose carried on the substrate, an elongated cord affixed at one end to the center of the compass rose and at least one linear distance scale on the substrate having its origin coincident with the center of the compass rose. In use, the navigation device is placed on a navigation chart, so that the center of the compass rose lies over a predetermined point of origin on the chart and the North compass direction of the rose is in parallel alignment with the North direction indicated on the navigation chart. A taut length of the cord is extended from the center of the compass rose to a predetermined destination point. The desired heading direction is noted where the cord crosses the perimeter of the compass rose. The linear extent of the cord form the point of origin to the destination point is marked and placed along the distance scale. The distance to be traveled is noted on the distance scale at the extremity of the marked cord length.
REFERENCES:
patent: 375590 (1887-12-01), Wilson
patent: 1638914 (1927-08-01), Brush
patent: 2004951 (1935-06-01), Jensen
patent: 2339516 (1944-01-01), Quillen
patent: 3193195 (1965-07-01), Jefferies
patent: 3855706 (1974-12-01), Price
Martin, Jr. William D.
Shanahan Thomas F.
Zurawsky Lawrence G.
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