MAGNETIC COMPASS Russian patent published in 1996 - IPC

FIELD: navigation equipment. SUBSTANCE: magnetic compass has case with working chamber filled with compass fluid, magnetic sensitive element and flexible compensator of temperature change of volume of compass fluid. Case of compass incorporates upper transparent cover with flange and lower part with flange. Cover and lower part of case have parts above flanges that form lag-spliced joint. Compensator of temperature change has elastic element placed outside of case fitted with sealing flange which cross-section has wedge- shaped outer surface, cylindrical inner surface and stepped surface by base of flange. Sealing flange is pressed against sealing joint of cover and lower part of case by means of sealing ring and washer ensuring tightness of joint between cover and lower part of case. Compass may have threaded plug with stop shutting filling hole and providing for reliable sealing of compass. Compensator of temperature change of volume of compass fluid communicates with working chamber through holes in lower part of case and simultaneously is used as discharge chamber. EFFECT: enhanced operational stability of magnetic compass. 3 cl, 1 dwg