GB384847A - Improvements in or relating to apparatus for facilitating the reading of navigational instruments - Google Patents

Improvements in or relating to apparatus for facilitating the reading of navigational instruments

Info

Publication number
GB384847A
GB384847A GB501332A GB501332A GB384847A GB 384847 A GB384847 A GB 384847A GB 501332 A GB501332 A GB 501332A GB 501332 A GB501332 A GB 501332A GB 384847 A GB384847 A GB 384847A
Authority
GB
United Kingdom
Prior art keywords
prism
reading
observer
hood
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
GB501332A
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 GB501332A priority Critical patent/GB384847A/en
Publication of GB384847A publication Critical patent/GB384847A/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)
  • Telescopes (AREA)

Abstract

384,847. Mariners' compasses. PAXTON, G., 195, Great Portland Street, London. Feb. 19, 1932, No. 5013. [Class 97 (ii).] An optical device for use in reading compasses. comprises a prism arranged to refract light from the compass card in a direction away from the observer and a mirror inclined to reflect the refracted light towards the observer. In the form shown a tubular ring 12 is attached to the compass pedestal and surrounds the gimbal mounted bowl 10. Rotatably mounted on the ring 12 is a bell-shaped cover 14 having a window 15, a housing for a lamp and a hood 17 in which are mounted a prism 26 and a mirror 20 angularly adjustable by means of the knob 22. The hood 17 is also provided with a protecting window 18 and sighting devices 32, 33. The prism 26 may be provided with a lens surface.
GB501332A 1932-02-19 1932-02-19 Improvements in or relating to apparatus for facilitating the reading of navigational instruments Expired GB384847A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB501332A GB384847A (en) 1932-02-19 1932-02-19 Improvements in or relating to apparatus for facilitating the reading of navigational instruments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB501332A GB384847A (en) 1932-02-19 1932-02-19 Improvements in or relating to apparatus for facilitating the reading of navigational instruments

Publications (1)

Publication Number Publication Date
GB384847A true GB384847A (en) 1932-12-15

Family

ID=9788091

Family Applications (1)

Application Number Title Priority Date Filing Date
GB501332A Expired GB384847A (en) 1932-02-19 1932-02-19 Improvements in or relating to apparatus for facilitating the reading of navigational instruments

Country Status (1)

Country Link
GB (1) GB384847A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0100683A2 (en) * 1982-08-02 1984-02-15 S.G. Brown Limited Apparatus for taking azimuth sights

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0100683A2 (en) * 1982-08-02 1984-02-15 S.G. Brown Limited Apparatus for taking azimuth sights
EP0100683A3 (en) * 1982-08-02 1984-03-21 S.G. Brown Limited Apparatus for taking azimuth sights

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