Geometrical instruments – Miscellaneous – Light direction
Patent
1975-12-08
1978-08-01
Aegerter, Richard E.
Geometrical instruments
Miscellaneous
Light direction
33 1N, 33109, G01C 2100
Patent
active
041034252
ABSTRACT:
A transparent plastic marine navigational protractor (chart overlay) which provides position from crossed bearings, new course to destination, course correction for drift, computation of estimated time of arrival, direct reading (conversion without reference to separate tables) of magnetic and steering compass equivalents of true geographic directions, continuous readout of dead reckoning and estimated positions, along with solutions to other relative motion problems, all without drawing any lines or resorting to the use of separate computer or scratch pad, and by using only one hand.
REFERENCES:
patent: 127949 (1872-06-01), Batchelder
patent: 1245304 (1917-11-01), Zona
patent: 2415277 (1947-02-01), Caston
patent: 2717448 (1955-09-01), Lubin et al.
patent: 3496640 (1970-02-01), Warner
patent: 3611574 (1971-10-01), Young et al.
Aegerter Richard E.
Shepperd John W.
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