GB246174A - Improvements in instructional devices for teaching arithmetic - Google Patents
Improvements in instructional devices for teaching arithmeticInfo
- Publication number
- GB246174A GB246174A GB1436/26A GB143626A GB246174A GB 246174 A GB246174 A GB 246174A GB 1436/26 A GB1436/26 A GB 1436/26A GB 143626 A GB143626 A GB 143626A GB 246174 A GB246174 A GB 246174A
- Authority
- GB
- United Kingdom
- Prior art keywords
- shaft
- drums
- teeth
- pinion
- pinions
- 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)
- Ink Jet (AREA)
- Transmission Devices (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
246,174. Stroebel, L. Jan. 17, 1925, [Convention date]. Adding and subtracting apparatus. - An appliance for teaching arithmetic comprises a series of numeral bearing drums 3, numbered from 0 to 9 and mounted loosely on a shaft 4 carried in a box 1, the drums being visible at an opening 2 and separated by pins 5 inserted in the shaft 4. On the right-hand side of each drum is a toothed wheel 3a provided with forty teeth and on the left-hand side a toothed sector 7 having four teeth. Movement is imparted to the drums from a shaft 8 bearing a pinion 9 provided with eight teeth so that half a revolution of the crank 10 serves to move a drum forward through one unit. Lateral movement of the pinion 9 to gear with any drum of the series is permitted by an arcuate groove 14 in the shaft 8 with which the pinion engages. Transfer mechcanism.-Transfer between the drums is effected by the engagement of the toothed sectors 7 with pinions 17, having eight teeth and carried by a shaft 16. The Specification as open to inspection under Sect. 91 (3) (a) comprises also means for effecting a driving connection between the pinion 9 and the shaft 8 consisting of a spring-pressed ball engaging depressions in the shaft. Similar arrangements are provided between the transfer pinions 17 and the shaft 16 to allow the transfer pinions to be disengaged from the drums, rotation of the pinions being allowed by circular grooves. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE246174X | 1925-01-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB246174A true GB246174A (en) | 1927-01-06 |
Family
ID=5934704
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1436/26A Expired GB246174A (en) | 1925-01-17 | 1926-01-18 | Improvements in instructional devices for teaching arithmetic |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB246174A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2476580A (en) * | 1944-09-21 | 1949-07-19 | Bergman Jack | Educational device |
CN105243924A (en) * | 2015-10-16 | 2016-01-13 | 于璐菁 | Assistive teaching aid for arithmetic teaching |
WO2016131068A3 (en) * | 2015-02-12 | 2016-12-01 | Ballew Tony Jay | Counting wheel odometer with movable decimal point |
-
1926
- 1926-01-18 GB GB1436/26A patent/GB246174A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2476580A (en) * | 1944-09-21 | 1949-07-19 | Bergman Jack | Educational device |
WO2016131068A3 (en) * | 2015-02-12 | 2016-12-01 | Ballew Tony Jay | Counting wheel odometer with movable decimal point |
US10127830B2 (en) * | 2015-02-12 | 2018-11-13 | Tony Jay Ballew | Place value teaching device |
CN105243924A (en) * | 2015-10-16 | 2016-01-13 | 于璐菁 | Assistive teaching aid for arithmetic teaching |
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