GB191113896A - Improvements in Mathematical Drawing Implements. - Google Patents

Improvements in Mathematical Drawing Implements.

Info

Publication number
GB191113896A
GB191113896A GB191113896DA GB191113896A GB 191113896 A GB191113896 A GB 191113896A GB 191113896D A GB191113896D A GB 191113896DA GB 191113896 A GB191113896 A GB 191113896A
Authority
GB
United Kingdom
Prior art keywords
ruler
screw
drawing implements
mathematical drawing
modification
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
Inventor
Adolf Schwieger
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of GB191113896A publication Critical patent/GB191113896A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L7/00—Straightedges
    • B43L7/10—Plural straightedges relatively movable
    • B43L7/12—Square and pivoted straightedges

Landscapes

  • Drawing Aids And Blackboards (AREA)

Abstract

13,896. Schwieger, A. June 10. Protractors; rulers.-A ruler a is pivoted at the centre of a protractor disk d and provided with holes c in which a pencil or the like can be inserted for describing circles &c. A screw f passes through the pivot and has at its end a pin point which, on turning the screw, presses into the paper &c. and secures the instrument. In a modification the graduated arc d is marked on a second ruler. A further modification is described in which, instead of perforating the ruler, a cursor with a hole in it is provided
GB191113896D 1911-06-10 1911-06-10 Improvements in Mathematical Drawing Implements. Expired GB191113896A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191113896T 1911-06-10

Publications (1)

Publication Number Publication Date
GB191113896A true GB191113896A (en) 1911-11-16

Family

ID=32500278

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191113896D Expired GB191113896A (en) 1911-06-10 1911-06-10 Improvements in Mathematical Drawing Implements.

Country Status (1)

Country Link
GB (1) GB191113896A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108340714A (en) * 2018-01-10 2018-07-31 徐康 A kind of higher mathematics written symbol ruler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108340714A (en) * 2018-01-10 2018-07-31 徐康 A kind of higher mathematics written symbol ruler

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