Geometrical instruments – Scriber – Curved line
Patent
1977-12-12
1979-05-15
Aegerter, Richard E.
Geometrical instruments
Scriber
Curved line
33 1SD, 33 76V, G01C 2120
Patent
active
041539958
ABSTRACT:
A navigation plotter for use with a map or chart having depicted thereon a line depicting a desired course and a compass rose. The plotter comprises a protractor designating angular graduations about a center axis. A linear scale member is mounted upon the protractor for rotation about the central axis. A grid on the linear scale member includes a plurality of sets of parallel lines. The respective sets of lines intersect one another repetitively and serve as visual guides to assist in aligning the linear scale member by arranging one set of lines parallel to the desired course while the protractor is held in registration with the compass rose. A series of radial lines on the linear scale member project from the central axis and are respectively parallel to the individual sets of lines in the grid. The radial lines register visually with the protractor to indicate the compass bearing corresponding to the selected course on the map.
REFERENCES:
patent: 932907 (1909-08-01), Rydman
patent: 1594602 (1926-08-01), Charlton
patent: 2345020 (1944-03-01), Warner
patent: 3280464 (1966-10-01), Warner
patent: 3303568 (1967-02-01), Geiger
patent: 3535783 (1970-10-01), Sena
patent: 3673690 (1972-07-01), De Barros
patent: 3813783 (1974-06-01), Price
patent: 3855706 (1974-12-01), Price
Aegerter Richard E.
Shepperd John W.
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