Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. -The Earths Magnetic Polesand Equator. EARTHS MAGNETISM. 43. Fig. 58.—Field of a Magnetised Steel Sphere Representing Earths Field. have a typical representation of the magnetic lines of forcesurrounding the earth, and called the earths The Magnetic Meridian—Declination.—Just as the geographical meridian is an im-aginary line, drawn on the earthssurface in a plane which passesthrough the geographical poles ofthe earth and a given place, so,also, the magnetic merid
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . Fig. -The Earths Magnetic Polesand Equator. EARTHS MAGNETISM. 43. Fig. 58.—Field of a Magnetised Steel Sphere Representing Earths Field. have a typical representation of the magnetic lines of forcesurrounding the earth, and called the earths The Magnetic Meridian—Declination.—Just as the geographical meridian is an im-aginary line, drawn on the earthssurface in a plane which passesthrough the geographical poles ofthe earth and a given place, so,also, the magnetic meridian maybe regarded as an imaginary linedrawn on the earth in a planewhich passes through the mag-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 angle be-tween them is known as the angleof declination of any given indicates just how far away from thetrue geographical north the compass needle Eartk*f$\poi*points. This angle of declination is very jv\IZfc\ slowly, but constantly changing. In New /f j
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