FR482539A - Improvements made to compasses or magnetic compasses - Google Patents

Improvements made to compasses or magnetic compasses

Info

Publication number
FR482539A
FR482539A FR482539DA FR482539A FR 482539 A FR482539 A FR 482539A FR 482539D A FR482539D A FR 482539DA FR 482539 A FR482539 A FR 482539A
Authority
FR
France
Prior art keywords
compasses
improvements made
magnetic
magnetic 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
Charles Frederick Ryland
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 FR482539A publication Critical patent/FR482539A/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
FR482539D 1915-08-16 1916-08-10 Improvements made to compasses or magnetic compasses Expired FR482539A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB482539X 1915-08-16

Publications (1)

Publication Number Publication Date
FR482539A true FR482539A (en) 1917-03-27

Family

ID=1519533

Family Applications (1)

Application Number Title Priority Date Filing Date
FR482539D Expired FR482539A (en) 1915-08-16 1916-08-10 Improvements made to compasses or magnetic compasses

Country Status (1)

Country Link
FR (1) FR482539A (en)

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