GB561360A - An improved conversion protractor and parallel rule - Google Patents
An improved conversion protractor and parallel ruleInfo
- 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
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.
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) |
-
1942
- 1942-12-07 GB GB1735342A patent/GB561360A/en not_active Expired
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