London: Hilger, 1968.

Illustrated by Illustrated. First Printing. Hardcover. Library stamps/marks/labels/pocket, cloth sunning, otherwise light wear. Solid hardcover.; Written by Late Senior Scientific Officer at the Admiralty Compass Observatory. Contents: 1. Introduction and Historical Background; 2. The Earth's Magnetic Field and Its Measurement; 3. Pivot-Needle Instruments; 4. Inductor Instruments; 5..... More