Magnetic needle compass construction - includes declination compensation disc between base and needle case, resting on edge of clamping ring

摘要

A needle case with a compass scale and magnetic needle is rotatably mounted on the base plate, with a declination compensation disc between them, which can be lifted with the needle case. A handle is on the underside of the delination compensation disc mounted in a concentric hole in the base plate. The edge facing the needle case rests on the edge of a clamping ring surrounding the needle case.