FR847170A - Improvements to topography sights - Google Patents

Improvements to topography sights

Info

Publication number
FR847170A
FR847170A FR847170DA FR847170A FR 847170 A FR847170 A FR 847170A FR 847170D A FR847170D A FR 847170DA FR 847170 A FR847170 A FR 847170A
Authority
FR
France
Prior art keywords
sights
topography
topography sights
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Other languages
French (fr)
Inventor
Mille Georges
Galland Charles Augustin
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Application granted granted Critical
Publication of FR847170A publication Critical patent/FR847170A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR847170D 1938-12-06 1938-12-06 Improvements to topography sights Expired FR847170A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR847170T 1938-12-06

Publications (1)

Publication Number Publication Date
FR847170A true FR847170A (en) 1939-10-04

Family

ID=9313696

Family Applications (1)

Application Number Title Priority Date Filing Date
FR847170D Expired FR847170A (en) 1938-12-06 1938-12-06 Improvements to topography sights

Country Status (1)

Country Link
FR (1) FR847170A (en)

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