GB1510467A - Instrument for obtaining a compass bearing - Google Patents

Instrument for obtaining a compass bearing

Info

Publication number
GB1510467A
GB1510467A GB3103474A GB3103474A GB1510467A GB 1510467 A GB1510467 A GB 1510467A GB 3103474 A GB3103474 A GB 3103474A GB 3103474 A GB3103474 A GB 3103474A GB 1510467 A GB1510467 A GB 1510467A
Authority
GB
United Kingdom
Prior art keywords
compass
card
graticule
bearing
housing
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
GB3103474A
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
Priority to GB3103474A priority Critical patent/GB1510467A/en
Publication of GB1510467A publication Critical patent/GB1510467A/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
    • G01C17/14—Comparing observed direction with north indication by reference marks, e.g. for ships' compasses

Landscapes

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

Abstract

1510467 Magnetic compass G COLLIS 25 June 1975 [12 July 1974] 31034/74 Heading G1F A magnetic compass comprises a compass card 11 mounted to rotate about a vertical axis within a housing 13, means for illuminating the compass card 11, an optical system 21, 22, 26 which projects a magnified image of part of the card 11 into an eye-piece, and a reference mark, e.g. a graticule 36, which may be aligned with an object whose bearing is to be determined, the bearing being read against the reference mark, the compass being without means for magnifying the object. As described, a sight (39), Fig. 2 (not shown) comprising a vertical luminized line e.g. a capillary tube filled with light emitting material, is mounted on a window 38 such that alignment of sight (39) and graticule 36 with the object allows the compass bearing thereof to be read off against the graticule 36. The transparent edge of the compass card 11 is illuminated by a tritium filled capsule 12, the card 11 being mounted within a capsule 10 filled with transparent liquid. Housing 13 is transparent or translucent to allow entry of light to further illuminate the card 11. Opaque wall 33 in the eye-piece allows light entering opaque housing 17 via window 37 not to enter the path of light from the compass card 11.
GB3103474A 1975-06-25 1975-06-25 Instrument for obtaining a compass bearing Expired GB1510467A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3103474A GB1510467A (en) 1975-06-25 1975-06-25 Instrument for obtaining a compass bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3103474A GB1510467A (en) 1975-06-25 1975-06-25 Instrument for obtaining a compass bearing

Publications (1)

Publication Number Publication Date
GB1510467A true GB1510467A (en) 1978-05-10

Family

ID=10316948

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3103474A Expired GB1510467A (en) 1975-06-25 1975-06-25 Instrument for obtaining a compass bearing

Country Status (1)

Country Link
GB (1) GB1510467A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5151753A (en) * 1990-10-10 1992-09-29 Whitman Iii Hobart A Non-parallax optical sighting instrument
GB2290613A (en) * 1994-06-22 1996-01-03 Suunto Oy Optically-readable bearing compass having means for correction of declination

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5151753A (en) * 1990-10-10 1992-09-29 Whitman Iii Hobart A Non-parallax optical sighting instrument
GB2290613A (en) * 1994-06-22 1996-01-03 Suunto Oy Optically-readable bearing compass having means for correction of declination
GB2290613B (en) * 1994-06-22 1998-04-15 Suunto Oy Optically readable bearing compass having means for correction of declination

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee