A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 825
6 E.,and is called the magnetic south pole. One agonic line, or line at every point of which the declinationis zero, or the compass points due north, runs through the AmericanContinent, and the other through Europe, Arabia, the Indian Oceanand Australia. At all points in the Atlantic space… … lATTl THE EARTHS MAGNETISM 801 an oval agonic line passing through China and Siberia, called theSiberian Oval, within which the declination is westerly. It will thus be seen that the isogonal lines have somewhat thecharacter of lines of longitude, in that their general tendency isto run from north…
Physics
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