Council Directive of 1 March 1971 on the approximation of the laws of the Member States relating to the rear-view mirrors of motor vehicles (71/127/EEC) (repealed)

[F1 Appendix 1 to Annex I PROCEDURE FOR DETERMINING THE RADIUS OF CURVATURE ‘ r ’ OF THE REFLECTING SURFACE OF A REAR-VIEW MIRROR

Textual Amendments

F1 Substituted by Commission Directive of 18 February 1985 adapting to technical progress Council Directive 71/127/EEC on the approximation of the laws of the Member States relating to the rear-view mirrors of motor vehicles (85/205/EEC).

1. MEASUREMENTS U.K.

1.1. Equipment U.K.

The ‘ spherometer ’ described in Figure 1 is used.

1.2. Measuring points U.K.

1.2.1. The principal radii of curvature shall be measured at three points situated as close as possible to positions at one-third, one-half and two-thirds of the distance along the arc of the reflecting surface passing through the centre of this surface and parallel to segment b, or of the arc passing through the centre of the reflecting surface which is perpendicular to it if this arc is the longer. U.K.

1.2.2. Where, owing to the size of the reflecting surface, it is impossible to obtain measurements in the directions defined in item 8 of this Annex, the technical services responsible for the tests may take measurements at the said point in two perpendicular directions as close as possible to those prescribed above. U.K.

2. CALCULATION OF THE RADIUS OF CURVATURE ‘r’ U.K.

‘ r ’ expressed in mm is calculated from the formula:

where:

r _p1

=

the radius of curvature at the first measuring point,

r _p2

=

the radius of curvature at the second measuring point,

r _p3

=

the radius of curvature at the third measuring point.]