Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 62
g-netic poles of the earth and agiven place, or a line in the verti-cal plane containing the axis ofa magnetic compass needle at anygiven place. At most places thegeographical and magnetic meri-dians differ, and the an,Lrle be-tween them is known as the angleof declination of any given place. It… … Fig. 58.—Field of a Magnetised Steel Sphere Representing Earths Field. / 4 i j W\ 12 W., which means that when the com- / I fr- I vN M ii pass needle comes to rest at this place thetme geographical north will be 9° 12 tothe east of the direction the needle points.Suppose a person to be located at…
Electricity · Magnetism
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