3158 NTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKIYHAPOTHAN OPrAHW3ALI IHO CTAHIAPTH3ALIN.ORGANISATION INTERNATIONALE DE NORMALISATION Timekeeping instruments - Symbolization of control positions Instruments horaires - Symbolisation des positions de controle First edition - 1976-02-01 UDC 681.11 : 658.562 Ref. No. 1SO 3158-1976 (E) ISO 3158-1976 Descriptors : time-measuring instruments, orientation, symbols. Price based on 3 pages Copyright International Organization for Standardization d without license from IHS Not for Resale FOREWORD ISO (the International Organization for Standardization) is a worldwide federation of national standards institutes (isO Member Bodies). The work of developing International Standards is carried out through ISO Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental and non-governmental, in liaison with isO, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the IsO Council. International Standard ISO 3158 was drawn up by Technical Committee ISO/TC 114, Horology, and circulated to the Member Bodies in April 1975. It has been approved by the Member Bodies of the following countries : Mexico Turkey Czechoslovakia France Portugal! United Kingdom Germany South Africa, Rep. of U.S.S.R. Ireland Japan Switzerland No Member Body expressed disapproval of the document. International Organization for Standardization, 1976 : Printed in Switzerland aadadz itted without licensefrom IHS Not for Resale ISO 3158-1976 (E) INTERNATIONAL STANDARD Timekeeping instruments -- Symbolization of control positions The range of 入 is : 0° <入<360°℃. (The range of 入 is 1 SCOPE ANDFIELDOFAPPLICATION between 0° and a value less than 360°.) This International Standard lays down the definition and designations of test positions for any timekeeping b) is the angle of rotation of the timekeeping instrument, irrespective of its type, design or dimensions. instrument about the axis perpendicular to plane zx (figure 2). > 0° means a rotation of the point on the dial which is momentarily highest when that point is moving away from the observer. 9<o° means a rotation of the above point when it is 2 DEFINITION moving towards the observer. The position of a timekeeping instrument or its movement is relative to direction Z, which is opposite to the direction The range of 9 is : - 90° ≤9≤ + 90°. (The range of 9 is of acceleration caused by gravity (figures 1 and 2). It is between ± 90°.) indicated by angles 入 and , which are defined as follows : c) For 入= 0° and = 0°, the axis passing through 6 hours and 12 hours shall coincide with direction Z. a) 入 is the angle of rotation of the timekeeping instrument about axis X, which is perpendicular to the (For timekeeping instruments not having a conventional (figure 1). The rotation dial and for movements, the specifications of clause 4 plane of the dial is counter-clockwise. apply.) Z 入= 0° 9= 0° = 0° 入 optional 91 9 = 91 入= 入1 入 optional 9= 0° Observation FIGURE1 FIGURE 2 1 Copyright International Organization for Standardization Not for Resale from IHS