The Gyro Compass:
Circular ball for gyrocompass
The real heart of the gyrocompass is the gyroscope ball. Inside this gyroscope sphere, two 90° offset and mechanically coupled, three-phase current gyroscopes rotate. These gyroscopes align the compass precisely in a north-south direction parallel to the earth's axis. Anschutz
Internal structure of the gyro ball with the two gyro motors.
Compare also: https://www.ostron.de/Mechanik/Anschuetz-Standard14-Kreiselkompass-STD14.html
