Paragraph 1 The Apparatus

The apparatus shall be constructed in accordance with the diagram and specifications shown below and shall consist of a cone so constructed as not visibly to distort under the forces applied during the measurement. The angle included between two opposite generating lines on the surface of the cone shall be 30°. Two lines shall be marked continuously round the surface of the cone, one where the diameter of the circular section of the cone is 60 millimetres and the other where the diameter is 75 millimetres. A means (such as a spring balance) shall be attached to the cone in such a way that it can be used to give an accurate indication of an axial force of 100 Newtons.