GB167075A - A combined parallel ruler and protractor - Google Patents

A combined parallel ruler and protractor

Info

Publication number
GB167075A
GB167075A GB2144720A GB2144720A GB167075A GB 167075 A GB167075 A GB 167075A GB 2144720 A GB2144720 A GB 2144720A GB 2144720 A GB2144720 A GB 2144720A GB 167075 A GB167075 A GB 167075A
Authority
GB
United Kingdom
Prior art keywords
limb
courses
parallel ruler
marked
centre
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
GB2144720A
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.)
LAURENCE HENRY MORRISON
Original Assignee
LAURENCE HENRY MORRISON
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 LAURENCE HENRY MORRISON filed Critical LAURENCE HENRY MORRISON
Priority to GB2144720A priority Critical patent/GB167075A/en
Publication of GB167075A publication Critical patent/GB167075A/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

Landscapes

  • Drawing Aids And Blackboards (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)

Abstract

167,075. Morrison, L. H. July 16, 1920. Protractors; rulers.-A drawing-instrument particularly intended for plotting courses &c. comprises a parallel ruler having a wide limb 1 and a narrow limb 2 connected by slotted links 3, 4. The limb 1 has a circular aperture in which is rotatably mounted a disc 9 marked with compass graduations and having a transparent central part which is divided into quadrants by lines passing through the cardinal points. The centre of the disc 9 lies on the centre-line 11 of the limb 1. The limb 1 is marked with diagrams for use in converting magnetic or compass courses to true courses or vice versa, and for correcting courses for. leeway.
GB2144720A 1920-07-16 1920-07-16 A combined parallel ruler and protractor Expired GB167075A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2144720A GB167075A (en) 1920-07-16 1920-07-16 A combined parallel ruler and protractor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2144720A GB167075A (en) 1920-07-16 1920-07-16 A combined parallel ruler and protractor

Publications (1)

Publication Number Publication Date
GB167075A true GB167075A (en) 1921-08-04

Family

ID=10163091

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2144720A Expired GB167075A (en) 1920-07-16 1920-07-16 A combined parallel ruler and protractor

Country Status (1)

Country Link
GB (1) GB167075A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736096A (en) * 1956-02-28 Radio plotter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736096A (en) * 1956-02-28 Radio plotter

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