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Old 5th January 2009 | 08:56
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forget
 
Joined: Jul 1999
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From: 58-33N. 00-18W. Peterborough UK
This any good? HERE.

Pitch limits.

A limitation imposed by a compass' construction is that the balancing bowl's pin, which is connected to a pivot point, only allows for, in most compasses, a pitch or bank of 18 degrees before the compass will touch the side of the casing. When the compass touches the side of the casing the freedom of the plane to rotate around the compass is lost and the compass becomes unreliable.
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