GB550499A - Improvements in magnetic compasses - Google Patents

Improvements in magnetic compasses

Info

Publication number
GB550499A
GB550499A GB541642A GB541642A GB550499A GB 550499 A GB550499 A GB 550499A GB 541642 A GB541642 A GB 541642A GB 541642 A GB541642 A GB 541642A GB 550499 A GB550499 A GB 550499A
Authority
GB
United Kingdom
Prior art keywords
compass
box
line
plates
fields
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
GB541642A
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 GB541642A priority Critical patent/GB550499A/en
Publication of GB550499A publication Critical patent/GB550499A/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)
  • Drawing Aids And Blackboards (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Instructional Devices (AREA)

Abstract

550,499. Magnetic compasses. JONSSON, A. April 22, 1942, No. 5416. [Class 97 (ii)] In a magnetic compass wherein the compass box 3 is rotatably mounted in a circular base 1 provided with an extension or rule 2 indicating the marching direction, the compass-box is provided with differently coloured plates or fields forming by their edges a number of parallel lines 9, 10, 11 the terminal points of which are situated at the periphery of the compass base. The plates or fields are provided on the top of the compass-box, or when the compass-box is wholly transparent the plates or fields are provided on the bottom. When the bearing between two places A and B on a map 18 is required the rule 2 is placed along the line A, B, and the compassbox 3 is rotated in the base and adjusted until a bearing line, e.g. the line 10 coincides with a meridian 19. When the north end of the needle 5 points towards the north-south line 8, the extension 2 indicates the marching direction.
GB541642A 1942-04-22 1942-04-22 Improvements in magnetic compasses Expired GB550499A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB541642A GB550499A (en) 1942-04-22 1942-04-22 Improvements in magnetic compasses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB541642A GB550499A (en) 1942-04-22 1942-04-22 Improvements in magnetic compasses

Publications (1)

Publication Number Publication Date
GB550499A true GB550499A (en) 1943-01-11

Family

ID=9795764

Family Applications (1)

Application Number Title Priority Date Filing Date
GB541642A Expired GB550499A (en) 1942-04-22 1942-04-22 Improvements in magnetic compasses

Country Status (1)

Country Link
GB (1) GB550499A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2226136A (en) * 1988-12-13 1990-06-20 Crisp & Wilson Ltd Location finding equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2226136A (en) * 1988-12-13 1990-06-20 Crisp & Wilson Ltd Location finding equipment

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