Earth is surrounded by a magnetic field generated by electric currents from within the planet. Compasses take advantage of this field to identify north and serve as a navigational aid. But one social ...

Our planet’s northern magnetic pole is not only racing toward Siberia at about 34 miles per year, it has been to Antarctica several times in the last million years—and it’s due to flip again. This isn ...

MR. GILLIE'S book contains within its small compass all the information necessary for those who wish to understand the factors on which the efficiency of the magnetic compass depends. Among its merits ...