GB1445718A - Mathematical teaching aid - Google Patents

Mathematical teaching aid

Info

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
Application number
GB2680573A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CLARK A J L CLARK J A
Original Assignee
CLARK A J L CLARK J A
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CLARK A J L CLARK J A filed Critical CLARK A J L CLARK J A
Priority to GB2680573A priority Critical patent/GB1445718A/en
Publication of GB1445718A publication Critical patent/GB1445718A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B19/00Teaching not covered by other main groups of this subclass
    • G09B19/02Counting; 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.
GB2680573A 1973-06-05 1973-06-05 Mathematical teaching aid Expired GB1445718A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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