FR715641A - Improvements to magnetic compasses - Google Patents

Improvements to magnetic compasses

Info

Publication number
FR715641A
FR715641A FR715641DA FR715641A FR 715641 A FR715641 A FR 715641A FR 715641D A FR715641D A FR 715641DA FR 715641 A FR715641 A FR 715641A
Authority
FR
France
Prior art keywords
magnetic compasses
compasses
magnetic
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
Harvey Newton Lumm
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 FR715641A publication Critical patent/FR715641A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR715641D 1930-11-17 1931-04-18 Improvements to magnetic compasses Expired FR715641A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US715641XA 1930-11-17 1930-11-17

Publications (1)

Publication Number Publication Date
FR715641A true FR715641A (en) 1931-12-07

Family

ID=22102133

Family Applications (1)

Application Number Title Priority Date Filing Date
FR715641D Expired FR715641A (en) 1930-11-17 1931-04-18 Improvements to magnetic compasses

Country Status (1)

Country Link
FR (1) FR715641A (en)

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