GB342099A - Improvements in apparatus to facilitate instruction in mathematics or the like - Google Patents
Improvements in apparatus to facilitate instruction in mathematics or the likeInfo
- Publication number
- GB342099A GB342099A GB36030A GB36030A GB342099A GB 342099 A GB342099 A GB 342099A GB 36030 A GB36030 A GB 36030A GB 36030 A GB36030 A GB 36030A GB 342099 A GB342099 A GB 342099A
- Authority
- GB
- United Kingdom
- Prior art keywords
- surveying
- mathematics
- disc
- finger
- piece
- 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
- G09B19/00—Teaching not covered by other main groups of this subclass
- G09B19/02—Counting; Calculating
Landscapes
- Business, Economics & Management (AREA)
- Engineering & Computer Science (AREA)
- Entrepreneurship & Innovation (AREA)
- Physics & Mathematics (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Length-Measuring Instruments Using Mechanical Means (AREA)
Abstract
342,099. Teaching mathematics and surveying. CHESHAM, H. W., Blue Coat School, Psalter Lane, Sheffield. Jan. 4, 1930, No. 360. [Class 146 (ii).] Apparatus for instruction in mathematics or surveying, and which may also be used as a protractor, comprises an index disc 1, provided with a circular scale of degrees, decimals &c., and a cover disc 3, the two discs engaging by means of radial slits, in known manner, for relative rotation, one slit edge of one disc passing through the slit in the other. In a modification, a scale is provided on the back of the cover disc 3. To facilitate rotation, semicircular slots are formed at the ends of the radial slits, directed oppositely in the two discs. The latter are rotatably mounted by means of a flanged, hollow sleeve 5, and a finger-piece 7. When used as a surveying-instrument, the apparatus is mounted either horizontally or vertically on a tripod stand 9, and a sight tube may be passed through apertures in the finger-piece 7.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB36030A GB342099A (en) | 1930-01-04 | 1930-01-04 | Improvements in apparatus to facilitate instruction in mathematics or the like |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB36030A GB342099A (en) | 1930-01-04 | 1930-01-04 | Improvements in apparatus to facilitate instruction in mathematics or the like |
Publications (1)
Publication Number | Publication Date |
---|---|
GB342099A true GB342099A (en) | 1931-01-29 |
Family
ID=9703016
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB36030A Expired GB342099A (en) | 1930-01-04 | 1930-01-04 | Improvements in apparatus to facilitate instruction in mathematics or the like |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB342099A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4060900A (en) * | 1975-06-26 | 1977-12-06 | Michael Peter Greenwood | Angle measuring device |
-
1930
- 1930-01-04 GB GB36030A patent/GB342099A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4060900A (en) * | 1975-06-26 | 1977-12-06 | Michael Peter Greenwood | Angle measuring device |
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