GB401897A - Improvements in educational appliances - Google Patents
Improvements in educational appliancesInfo
- Publication number
- GB401897A GB401897A GB3469932A GB3469932A GB401897A GB 401897 A GB401897 A GB 401897A GB 3469932 A GB3469932 A GB 3469932A GB 3469932 A GB3469932 A GB 3469932A GB 401897 A GB401897 A GB 401897A
- Authority
- GB
- United Kingdom
- Prior art keywords
- protractor
- outs
- polygons
- cut
- similar
- 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
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/02—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for mathematics
- G09B23/04—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for mathematics for geometry, trigonometry, projection or perspective
Landscapes
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Geometry (AREA)
- Business, Economics & Management (AREA)
- Algebra (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- Theoretical Computer Science (AREA)
- Toys (AREA)
Abstract
401,897. Drawing templets ; protractors. DIXON, E. L., 2206, Elsinor Avenue, Baltimore, U.S.A. Dec. 7, 1932, No. 34699. [Class 97 (iii).] A drawing- appliance for tracing polygons &c. comprises a sheet 1 of substantially rigid material provided with one or more polygonal cut-outs having marks 13 provided along the sides, dividing them into segments in the same ratio for each such side whereby similar polygons of different sizes may be formed. The cut-outs represent triangles, quadrilaterals, pentagons &c. all, except the regular pentagon, having angles which are multiples of 5‹ and 10‹. A protractor 18 is provided, having 5‹ and 10‹ measurements as shown and slots 20, 20<1> overlapping slightly and formed with discontinuous parts 21 serving to unite the protractor rigidly to the main body of the device. Scales 22, 23 are provided, and also spaced apertures 24, 241, 25-27 to facilitate the ruling of parallel lines. Two sets of serrations 28, 29 enable dotted or similar lines to be drawn.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3469932A GB401897A (en) | 1932-12-07 | 1932-12-07 | Improvements in educational appliances |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3469932A GB401897A (en) | 1932-12-07 | 1932-12-07 | Improvements in educational appliances |
Publications (1)
Publication Number | Publication Date |
---|---|
GB401897A true GB401897A (en) | 1933-11-23 |
Family
ID=10368858
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3469932A Expired GB401897A (en) | 1932-12-07 | 1932-12-07 | Improvements in educational appliances |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB401897A (en) |
-
1932
- 1932-12-07 GB GB3469932A patent/GB401897A/en not_active Expired
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