GB551072A - Improvements connected with parallel rules - Google Patents

Improvements connected with parallel rules

Info

Publication number
GB551072A
GB551072A GB138042A GB138042A GB551072A GB 551072 A GB551072 A GB 551072A GB 138042 A GB138042 A GB 138042A GB 138042 A GB138042 A GB 138042A GB 551072 A GB551072 A GB 551072A
Authority
GB
United Kingdom
Prior art keywords
parallel
metal plate
transparent material
improvements connected
degree markings
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
GB138042A
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
Priority to GB138042A priority Critical patent/GB551072A/en
Publication of GB551072A publication Critical patent/GB551072A/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
    • 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
    • B43L7/125—Comprising at least two straightedges remaining parallel

Landscapes

  • Length-Measuring Instruments Using Mechanical Means (AREA)

Abstract

551,072. Parallel rulers; protractors. MACLEAN, J. D. Feb. 2, 1942, No. 1380. [Class 97 (iii)] A parallel rule is constructed of transparent material M with a metal plate J secured to its lower surface and projecting slightly beyond the outer edge. The metal plate is marked on its upper face with degree markings read through the transparent material thereby minimizing errors due to parallax. Transverse slots C with degree markings are provided at each end as described in Specification 543,881.
GB138042A 1942-02-02 1942-02-02 Improvements connected with parallel rules Expired GB551072A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB138042A GB551072A (en) 1942-02-02 1942-02-02 Improvements connected with parallel rules

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB138042A GB551072A (en) 1942-02-02 1942-02-02 Improvements connected with parallel rules

Publications (1)

Publication Number Publication Date
GB551072A true GB551072A (en) 1943-02-05

Family

ID=9721005

Family Applications (1)

Application Number Title Priority Date Filing Date
GB138042A Expired GB551072A (en) 1942-02-02 1942-02-02 Improvements connected with parallel rules

Country Status (1)

Country Link
GB (1) GB551072A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192286A (en) * 1986-06-27 1988-01-06 Smiths Industries Plc Parallel protractor rule

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192286A (en) * 1986-06-27 1988-01-06 Smiths Industries Plc Parallel protractor rule

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