Foreword

Publishing information

This British Standard is published by BSI and came into effect on 30 November 2008. It was prepared by Technical Committee TDW/4, Technical, product realization (TPR).A list of organizations represented on this committee can be obtained on request to its secretary.

Supersession

This British Standard supersedes BS 1685:1951, which is withdrawn.

Information about this document

This new edition has been fully revised to bring it up to date.

The start and ﬁnish of text introduced or altered by Corrigendum No. 1 is indicated in the text by tags .

Presentational conventions

The provisions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”.

Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element.

Contractual and legal considerations

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

COMMENTARY ON1: The ﬁtting of an acute angle attachment is optional.

NOTE Attention is drawn to the fact that the metric dimensions are not necessarily direct conversions of the imperial dimensions.

Publishing and copyright information

The BSI copyright notice displayed in this document indicates when the document was last issued.

The following BSI references relate to the work on this standard: Committee reference TDW/4 Draft for comment 08/30177880 DC

Publication history

First published May 1951

Second edition November 2008

1 Scope

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.

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

BS 1685:2008

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

Current

Published:

30 Nov 2008