Note link just below if you don't get an answer. My home page magazine articles, lectures. Anders Ansar, Kungsholms Str. Modified September 2000. You are visitor number 208 since September 2000.
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Generally about mounting All materials used for mounting and situated near the compass must be nonmagnetic or the function of the compass will be disturbed. You can check if something, e g a screw, is nonmagnetic by nearing it to the compass and also moving it sideways along the face of the cupola. If the reading of the compass doesn't change it is nonmagnetic. Compasses disturb each other if they are placed too close. The compass housing consists of two cupola which must be free to move with respect to each other, to compensate for temperature differences.