# The Fishing Vessels (Safety Provisions) Rules 1975, Paragraph 10


The minimum thickness of the metal used in the construction of the compass shall be as follows:—
Compass bowl
4·0 millimetres
Binnacle
3·85 millimetres
Lamp
3·85 millimetres
The compass bowl shall be efficiently stiffened to take gimbal pins. The binnacle shell shall be swaged or spun into the base ring and soldered all round.
The gimbal ring shall be of naval brass or other rigid non-magnetic metal 15 millimetres by 3 millimetres. Gimbal pins shall be of naval brass or other hard non-magnetic material of 6 millimetres diameter: both they and the bearings in which they engage shall be perfectly smooth.

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Source: https://www.legislation.gov.uk/uksi/1975/330/schedule/14/paragraph/10 (the official version)
Page: https://openlegislation.uk/fishing-vessels-safety-provisions-rules-1975/schedule-14/paragraph-10
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.