GB561360A - An improved conversion protractor and parallel rule - Google Patents

An improved conversion protractor and parallel rule

Info

Publication number
GB561360A
GB561360A GB1735342A GB1735342A GB561360A GB 561360 A GB561360 A GB 561360A GB 1735342 A GB1735342 A GB 1735342A GB 1735342 A GB1735342 A GB 1735342A GB 561360 A GB561360 A GB 561360A
Authority
GB
United Kingdom
Prior art keywords
dial
plate
bearing
magnetic
pointer
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
GB1735342A
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 GB1735342A priority Critical patent/GB561360A/en
Publication of GB561360A publication Critical patent/GB561360A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B29/00—Maps; Plans; Charts; Diagrams, e.g. route diagram

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Business, Economics & Management (AREA)
  • Educational Administration (AREA)
  • Educational Technology (AREA)
  • General Physics & Mathematics (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)

Abstract

561,360. Protractors and the like. SHAW, C. G. Dec. 7, 1942, No. 17353. [Class 97 (iii)] Relates to a protractor for converting and transferring bearings to or from maps, charts, &c. A square plate c is divided into 360 degrees around its periphery and is termed the grid-bearing plate. A similarly marked dial a termed the magnetic bearing dial is mounted on the plate c together with a pointer h and an apertured centre piece j, the whole being adapted to be adjusted and clamped together by means of a screw bush n. The device is fixed to a chart or map so that the observer's position is indicated through the central aperture of the piece j and the N.S. line of the grid bearing plate is set parallel to the grid lines of the, map which has been oriented. The magnetic dial is rotated to represent the magnetic variation and the pointer h is rotated to point along the line whose bearing is being ascertained. The reading on the dial a between N and the pointer indicates the desired magnetic bearing. The reverse side of the plate c is marked in any manner such as is indicated in Fig. 5.
GB1735342A 1942-12-07 1942-12-07 An improved conversion protractor and parallel rule Expired GB561360A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1735342A GB561360A (en) 1942-12-07 1942-12-07 An improved conversion protractor and parallel rule

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1735342A GB561360A (en) 1942-12-07 1942-12-07 An improved conversion protractor and parallel rule

Publications (1)

Publication Number Publication Date
GB561360A true GB561360A (en) 1944-05-16

Family

ID=10093688

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1735342A Expired GB561360A (en) 1942-12-07 1942-12-07 An improved conversion protractor and parallel rule

Country Status (1)

Country Link
GB (1) GB561360A (en)

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