GB1445718A - Mathematical teaching aid - Google Patents
Mathematical teaching aidInfo
- Publication number
- GB1445718A GB1445718A GB2680573A GB2680573A GB1445718A GB 1445718 A GB1445718 A GB 1445718A GB 2680573 A GB2680573 A GB 2680573A GB 2680573 A GB2680573 A GB 2680573A GB 1445718 A GB1445718 A GB 1445718A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dial
- dialling
- digits
- sets
- disc
- 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)
- Time Recorders, Dirve Recorders, Access Control (AREA)
Abstract
1445718 Mechanical calculating apparatus A J L CLARK J A CLARK and G N PORTER 29 May 1974 [5 June 1973] 26805/73 Headings G4B and G5G A calculating and teaching device for simple arithmetic comprises a dialling disc 3 having finger engaging recesses or holes 20 aligning with two sets of dialling digits 1-9 in respective opposing halves of the dial, and a finger stop 6 so located that a selected number may be dialled in an "additive" or "subtractive" sense depending upon the sense of rotation of the dial towards the finger stop. The dialling disc carries two serially arranged sets of lower denominational digits and a second coaxial disc carries the higher order digits. "Tens transfer" is attained by the co-operation of two pinions 9a, 9b with the face of a cam (not shown) and the two digit sets are arranged to generate a multi denominational number at the viewing position. Preferably a transparent disc (Fig. 5, not shown) is provided which is rotatably mountable upon the dial and labelled with units and decimal point markings to be selectively associated with the calculation displayed. A tally spinner (Fig. 4, not shown) enables a record of dial revolutions associated with a multiplication action, to be made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2680573A GB1445718A (en) | 1973-06-05 | 1973-06-05 | Mathematical teaching aid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2680573A GB1445718A (en) | 1973-06-05 | 1973-06-05 | Mathematical teaching aid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1445718A true GB1445718A (en) | 1976-08-11 |
Family
ID=10249516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2680573A Expired GB1445718A (en) | 1973-06-05 | 1973-06-05 | Mathematical teaching aid |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1445718A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2391999A (en) * | 2002-08-13 | 2004-02-18 | Sumanasiri Wijesingh Ekanayake | Educational number device for addition and subtraction |
| CN113593368A (en) * | 2021-08-12 | 2021-11-02 | 陈红梅 | Preschool education intelligence-benefiting model device and operation method |
-
1973
- 1973-06-05 GB GB2680573A patent/GB1445718A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2391999A (en) * | 2002-08-13 | 2004-02-18 | Sumanasiri Wijesingh Ekanayake | Educational number device for addition and subtraction |
| CN113593368A (en) * | 2021-08-12 | 2021-11-02 | 陈红梅 | Preschool education intelligence-benefiting model device and operation method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |