With the azimuth device on the compass the direction of a celestial body can be determined, expressed in degrees. Used, among other things, to determine the deviation of the compass.
The black lackered, brass instrument comes with a loose pen in a mahogany case with beautiful dovetail connections and leather carrying strap.
B. Cooke & Son Ltd. has a proud history since 1863 and reputation as British Admiralty Chart Distributor, Nautical Instrument Manufacturers and resellers and is still operating in Hull.

Catalog: NM.5-49
Date: ca. 1940
HWL: 15x19x23 cm
HWL case: 18.5×26.5×28 cm
Signed: B. Cooke & Son Ltd, instrument makers Hull, Est. 1863
Origin: England
Condition: in perfect condition, wear consistent with age and use