Earth-inductor compasses

Introduced: September 1968

Last revised: January 2006

Full Title

Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes > Magnetic compasses > Electromagnetic compasses > Earth-inductor compasses

Classification Context

Section:: PHYSICS
Class:: MEASURING; TESTING
Subclass:: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY