Magnetic Declinometer

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Declinometer, Magnetic

 

an instrument for observing diurnal variations of magnetic declination. It is sometimes used for underground surveying (determinations of magnetic azimuths at survey points).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.