FR884389A -
Sighting or pointing device, in particular for compasses, instruments for measuring angles of height and the like, such as a compass and instrument for measuring angles of height, provided with such an apparatus
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Sighting or pointing device, in particular for compasses, instruments for measuring angles of height and the like, such as a compass and instrument for measuring angles of height, provided with such an apparatus
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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
G01C17/10—Comparing observed direction with north indication
G01C17/12—Comparing observed direction with north indication by sighting means, e.g. for surveyors' compasses
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Radar, Positioning & Navigation
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Physics & Mathematics
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General Physics & Mathematics
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FR884389D1940-12-021940-12-02
Sighting or pointing device, in particular for compasses, instruments for measuring angles of height and the like, such as a compass and instrument for measuring angles of height, provided with such an apparatus
ExpiredFR884389A
(en)
Sighting or pointing device, in particular for compasses, instruments for measuring angles of height and the like, such as a compass and instrument for measuring angles of height, provided with such an apparatus
Sighting or pointing device, in particular for compasses, instruments for measuring angles of height and the like, such as a compass and instrument for measuring angles of height, provided with such an apparatus