With the azimuth mirror 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 mirror of unknown maker is never used and comes with a loose pen in a wooden case. The spare pen is missing.

Catalogue: NM.5-48
Date: ca. 1940
HD: 23×13 cm
HWL case: 16.5x26x26 cm
Signed: Patt. 996, No 795
Origin: USA or England
Condition: in perfect condition