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FR441870A - Improvements to marine compasses - Google Patents

Improvements to marine compasses

Info

Publication number
FR441870A
FR441870A FR441870DA FR441870A FR 441870 A FR441870 A FR 441870A FR 441870D A FR441870D A FR 441870DA FR 441870 A FR441870 A FR 441870A
Authority
FR
France
Prior art keywords
compasses
marine
marine compasses
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
Louis Allen Sherman
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR441870A publication Critical patent/FR441870A/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)
FR441870D 1912-03-28 1912-03-28 Improvements to marine compasses Expired FR441870A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR441870T 1912-03-28

Publications (1)

Publication Number Publication Date
FR441870A true FR441870A (en) 1912-08-19

Family

ID=1483085

Family Applications (1)

Application Number Title Priority Date Filing Date
FR441870D Expired FR441870A (en) 1912-03-28 1912-03-28 Improvements to marine compasses

Country Status (1)

Country Link
FR (1) FR441870A (en)

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