THE U.S. Coast and Geodetic Survey makes magnetic observations at a set of repeat stations every five years, and publishes the results at similar intervals, in the form of tables of secular variation, ...
THE activity of the United States Coast and Geodetic Survey Department in carrying out a magnetic survey of the States and outlying territories has long been a subject of interest to magneticians, and ...
If you're annoyed that your pocket compass doesn't point exactly to true north, then head for Greenwich, England, where magnetic north and true north are synching over the next two weeks for the first ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results