GB706807A - Improvements in devices for illustrating and teaching the elementary technic of calculating - Google Patents

Improvements in devices for illustrating and teaching the elementary technic of calculating

Info

Publication number
GB706807A
GB706807A GB2730151A GB2730151A GB706807A GB 706807 A GB706807 A GB 706807A GB 2730151 A GB2730151 A GB 2730151A GB 2730151 A GB2730151 A GB 2730151A GB 706807 A GB706807 A GB 706807A
Authority
GB
United Kingdom
Prior art keywords
plates
plate
apertures
groups
calculating
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
GB2730151A
Inventor
Sven Hjalmar Svensson
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.)
Skolmaterieldistrib A B
Original Assignee
Skolmaterieldistrib A B
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 Skolmaterieldistrib A B filed Critical Skolmaterieldistrib A B
Priority to GB2730151A priority Critical patent/GB706807A/en
Publication of GB706807A publication Critical patent/GB706807A/en
Expired legal-status Critical Current

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)
  • Toys (AREA)
  • Food-Manufacturing Devices (AREA)

Abstract

706,807. Calculating-apparatus. SKOLMATERIELDISTRIBUTION AKTIEBOLAG. Nov. 21, 1951, No. 27301/51. Class 106 (1). [Also in Group XV] An adding and subtracting device comprises a lower plate 4 and an upper apertured plate 5, the plates being fixed to and covering each other, and two additional superposed plates 7 and 8 disposed between the plates 4 and 5, the plates 7 and 8 having different surface appearances and being movable to expose the plate 4 through one at a time of the apertures 6 in the plate 5, the plate 4 having a different surface appearance from the other plates so that when the plates 7 and 8 are moved relatively to each other and to plates 4 and 5 the apertures 6 from which plate 5 is withdrawn are divided into two groups of different appearance, a scale 3 being combined with the plates for reading the sum of the apertures of the two groups. Plates 7 and 8 and a covering layer 15 on plate 4 may be differently coloured or patterned. Plates 7 and 8 are shaped as at 12, 13 so that they may be positioned by means of members 9 and 10 so as to expose odd or even numbers ; thus Fig. 1 illustrates the addition 5 + 8. Adjacent to rail 1 the plate 5 is provided with a slot 14 through which the edges of plates 7 and 8 are visible, and layer 15 and plate 7 may be provided with scales which appear in slot 14. The device may be constructed in the form of a rule, and the holes 6 may be divided into groups by lines 16.
GB2730151A 1951-11-21 1951-11-21 Improvements in devices for illustrating and teaching the elementary technic of calculating Expired GB706807A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2730151A GB706807A (en) 1951-11-21 1951-11-21 Improvements in devices for illustrating and teaching the elementary technic of calculating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2730151A GB706807A (en) 1951-11-21 1951-11-21 Improvements in devices for illustrating and teaching the elementary technic of calculating

Publications (1)

Publication Number Publication Date
GB706807A true GB706807A (en) 1954-04-07

Family

ID=10257354

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2730151A Expired GB706807A (en) 1951-11-21 1951-11-21 Improvements in devices for illustrating and teaching the elementary technic of calculating

Country Status (1)

Country Link
GB (1) GB706807A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2321985A (en) * 1997-02-05 1998-08-12 Agamemnon Charal Hadjigeorgiou Slide rule

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2321985A (en) * 1997-02-05 1998-08-12 Agamemnon Charal Hadjigeorgiou Slide rule
GB2321985B (en) * 1997-02-05 2001-09-05 Agamemnon Charal Hadjigeorgiou Slide rule

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