GB342193A - A combination drafting appliance for use with blackboards - Google Patents

A combination drafting appliance for use with blackboards

Info

Publication number
GB342193A
GB342193A GB839130A GB839130A GB342193A GB 342193 A GB342193 A GB 342193A GB 839130 A GB839130 A GB 839130A GB 839130 A GB839130 A GB 839130A GB 342193 A GB342193 A GB 342193A
Authority
GB
United Kingdom
Prior art keywords
arm
blackboards
lancasterian
angled member
graduated
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
GB839130A
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.)
JOHN CAMPBELL MILLAR
Original Assignee
JOHN CAMPBELL MILLAR
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 JOHN CAMPBELL MILLAR filed Critical JOHN CAMPBELL MILLAR
Priority to GB839130A priority Critical patent/GB342193A/en
Publication of GB342193A publication Critical patent/GB342193A/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

342,193. Drawing-instruments. MILLAR, J. C., Lancasterian House, Lancasterian Street, Carrickfergus, Ireland. March 15, 1930, No. 8391. [Class 97 (iii).] An instrument intended to be used on a blackboard in conjunction with a tee-square comprises a rigid right-angled member 1 having pivoted at the extremity of one of its limbs 2 a graduated straight arm 7 serving as a ruler. A graduated protractor segment 10 is secured to the arm 7, passes through a slot in the limb 2, and is itself slotted to receive a clamping-screw 14. When folded the arm 7 fits into the corner 8 of the right-angled member 1.
GB839130A 1930-03-15 1930-03-15 A combination drafting appliance for use with blackboards Expired GB342193A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB839130A GB342193A (en) 1930-03-15 1930-03-15 A combination drafting appliance for use with blackboards

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB839130A GB342193A (en) 1930-03-15 1930-03-15 A combination drafting appliance for use with blackboards

Publications (1)

Publication Number Publication Date
GB342193A true GB342193A (en) 1931-01-29

Family

ID=9851617

Family Applications (1)

Application Number Title Priority Date Filing Date
GB839130A Expired GB342193A (en) 1930-03-15 1930-03-15 A combination drafting appliance for use with blackboards

Country Status (1)

Country Link
GB (1) GB342193A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2379514A (en) * 2001-09-11 2003-03-12 Albert Frank Ellam An adjustable squaring tool

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2379514A (en) * 2001-09-11 2003-03-12 Albert Frank Ellam An adjustable squaring tool
GB2379514B (en) * 2001-09-11 2003-09-03 Albert Frank Ellam Squaring tool

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