FR421725A - Appareil pour la conversion de routes astronomiques ou vraies, de routes magnétiques, de routes au compas et d'autres routes similaires
- Google Patents
Appareil pour la conversion de routes astronomiques ou vraies, de routes magnétiques, de routes au compas et d'autres routes similaires
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G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
G01C17/02—Magnetic compasses
G01C17/04—Magnetic compasses with north-seeking magnetic elements, e.g. needles
G01C17/20—Observing the compass card or needle
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Engineering & Computer Science
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Radar, Positioning & Navigation
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Physics & Mathematics
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General Physics & Mathematics
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FR421725D1910-10-221910-10-22Appareil pour la conversion de routes astronomiques ou vraies, de routes magnétiques, de routes au compas et d'autres routes similaires
ExpiredFR421725A
(fr)