The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
ships designed for magnetic surveying and other magnetic studies of the earth on the surface of seas and oceans. An example of a nonmagnetic ship is the schooner Zaria.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.