FR491546A - Simultaneous sighting and reading compass - Google Patents

Simultaneous sighting and reading compass

Info

Publication number
FR491546A
FR491546A FR491546DA FR491546A FR 491546 A FR491546 A FR 491546A FR 491546D A FR491546D A FR 491546DA FR 491546 A FR491546 A FR 491546A
Authority
FR
France
Prior art keywords
reading compass
sighting
simultaneous
simultaneous sighting
compass
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)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compagnie des Montres Longines Francillon SA
Original Assignee
Fabrique des Longines Francillon et Co SA
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 by Fabrique des Longines Francillon et Co SA filed Critical Fabrique des Longines Francillon et Co SA
Application granted granted Critical
Publication of FR491546A publication Critical patent/FR491546A/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)
FR491546D 1918-08-09 1918-08-24 Simultaneous sighting and reading compass Expired FR491546A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH491546X 1918-08-09

Publications (1)

Publication Number Publication Date
FR491546A true FR491546A (en) 1919-06-06

Family

ID=1527536

Family Applications (1)

Application Number Title Priority Date Filing Date
FR491546D Expired FR491546A (en) 1918-08-09 1918-08-24 Simultaneous sighting and reading compass

Country Status (1)

Country Link
FR (1) FR491546A (en)

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