FR521502A - Liquid or non-liquid compass with device to facilitate reading of the rose - Google Patents

Liquid or non-liquid compass with device to facilitate reading of the rose

Info

Publication number
FR521502A
FR521502A FR521502A FR521502DA FR521502A FR 521502 A FR521502 A FR 521502A FR 521502 A FR521502 A FR 521502A FR 521502D A FR521502D A FR 521502DA FR 521502 A FR521502 A FR 521502A
Authority
FR
France
Prior art keywords
liquid
rose
compass
facilitate reading
reading
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
FR521502A
Other languages
French (fr)
Inventor
Abel-Louis Doignon
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.)
ABEL-LOUIS DOIGNON
Original Assignee
ABEL-LOUIS DOIGNON
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 ABEL-LOUIS DOIGNON filed Critical ABEL-LOUIS DOIGNON
Application granted granted Critical
Publication of FR521502A publication Critical patent/FR521502A/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
    • G01C17/20—Observing the compass card or needle
    • G01C17/24—Illumination

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR521502A 1919-11-28 1919-11-28 Liquid or non-liquid compass with device to facilitate reading of the rose Expired FR521502A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR521502T 1919-11-28

Publications (1)

Publication Number Publication Date
FR521502A true FR521502A (en) 1921-07-15

Family

ID=8917296

Family Applications (1)

Application Number Title Priority Date Filing Date
FR521502A Expired FR521502A (en) 1919-11-28 1919-11-28 Liquid or non-liquid compass with device to facilitate reading of the rose

Country Status (1)

Country Link
FR (1) FR521502A (en)

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