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BS 1685:2008

Current

Current

The latest, up-to-date edition.

Bevel protractors (mechanical and optical). Requirements and test methods

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-08-2009

Foreword
1 Scope
2 Nomenclature
3 Normative references
4 Material
5 General design and workmanship
6 Body
7 Stock
8 Blade
9 Acute angle attachment
10 Graduations
11 Marking
12 Case

Explains the following types of bevel protractors: a) Mechanical - (i) Type A - With vernier graduated to read to five minutes of arc, and with slow motion device, and acute angle attachment. (ii) Type B - With vernier graduated to read to five minutes of arc, but without slow motion device or acute angle attachment. (iii) Type C - With scale graduated in degrees, without vernier or slow motion device or acute angle attachment. b) Optical - With an internal circular scale which is graduated in divisions of 10 minutes of arc and read against a fixed index line or vernier by means of an optical magnifying system integral with the instrument, enabling readings to be taken, by estimation or otherwise, to approximately two minutes of arc.

Committee
TPR/1
DevelopmentNote
Supersedes BS 1685(1951) & 08/30177880 DC. (11/2008)
DocumentType
Standard
Pages
12
PublisherName
British Standards Institution
Status
Current
Supersedes

This standard relates to the following types of bevel protractors: Mechanical. Type A. With vernier graduated to read to five minutes of arc, and with slow motion device, and acute angle attachment. Type B. With vernier graduated to read to five minutes of arc, but without slow motion device or acute angle attachment. Type C. With scale graduated in degrees, without vernier or slow motion device or acute angle attachment. Optical. With an internal circular scale which is graduated in divisions of 10 minutes of arc1) and read against a fixed index line or vernier by means of an optical magnifying system integral with the instrument, enabling readings to be taken, by estimation or otherwise, to approximately two minutes of arc.

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