FR2414717A1 - Measurement of deviations for compass correction - is performed by taking bearings of distant object as boat moves - Google Patents

Measurement of deviations for compass correction - is performed by taking bearings of distant object as boat moves

Info

Publication number
FR2414717A1
FR2414717A1 FR7800632A FR7800632A FR2414717A1 FR 2414717 A1 FR2414717 A1 FR 2414717A1 FR 7800632 A FR7800632 A FR 7800632A FR 7800632 A FR7800632 A FR 7800632A FR 2414717 A1 FR2414717 A1 FR 2414717A1
Authority
FR
France
Prior art keywords
deviations
boat
distant object
measurement
boat moves
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.)
Withdrawn
Application number
FR7800632A
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.)
MONGE JEAN
Original Assignee
MONGE JEAN
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 MONGE JEAN filed Critical MONGE JEAN
Priority to FR7800632A priority Critical patent/FR2414717A1/en
Publication of FR2414717A1 publication Critical patent/FR2414717A1/en
Withdrawn legal-status Critical Current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
    • G01C17/38—Testing, calibrating, or compensating of compasses

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Navigation (AREA)

Abstract

Measurements are made rapidly and precisely to determine or curve of deviations of a marine compass from the actual magnetic direction of a boat or ship. This is performed by sighting distant object as the boat moves through the several orientations. A sighting glass (1) is supported by adjustable tripod (4) and is mounted on pivot (2) supported by ball (5) which permits orientation of sight around horizon. A ring (7) with equidistant notches determines number of sightings. Adjustment is made by index (13) onto zero of vernier (9) and with boat axis. Sight is aligned with object and locked when magnetic direction from chart is indicated.
FR7800632A 1978-01-11 1978-01-11 Measurement of deviations for compass correction - is performed by taking bearings of distant object as boat moves Withdrawn FR2414717A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7800632A FR2414717A1 (en) 1978-01-11 1978-01-11 Measurement of deviations for compass correction - is performed by taking bearings of distant object as boat moves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7800632A FR2414717A1 (en) 1978-01-11 1978-01-11 Measurement of deviations for compass correction - is performed by taking bearings of distant object as boat moves

Publications (1)

Publication Number Publication Date
FR2414717A1 true FR2414717A1 (en) 1979-08-10

Family

ID=9203301

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7800632A Withdrawn FR2414717A1 (en) 1978-01-11 1978-01-11 Measurement of deviations for compass correction - is performed by taking bearings of distant object as boat moves

Country Status (1)

Country Link
FR (1) FR2414717A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB143838A (en) * 1919-05-23 1920-12-16 Walter Wingate Improvements in bearing finders
US2099772A (en) * 1937-02-15 1937-11-23 Frank V Seidelhuber Pelorus
US2519191A (en) * 1945-08-09 1950-08-15 Jassy David Alidade bearing indicator
GB1265218A (en) * 1969-08-04 1972-03-01

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB143838A (en) * 1919-05-23 1920-12-16 Walter Wingate Improvements in bearing finders
US2099772A (en) * 1937-02-15 1937-11-23 Frank V Seidelhuber Pelorus
US2519191A (en) * 1945-08-09 1950-08-15 Jassy David Alidade bearing indicator
GB1265218A (en) * 1969-08-04 1972-03-01

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Legal Events

Date Code Title Description
ST Notification of lapse
AR Application made for restoration
BR Restoration of rights
ST Notification of lapse