Electricity and magnetism for advanced students (1920)
Starling, Sydney George, 1873- · London Longmans, Green · leaf 43
s of the needle, theverniers being then read. To begin observations, the instrument is levelled and thenrotated about its vertical axis until the needle sets vertically,i.e. reads 90^—90°. The plane in which the needle rotates isthen at right angles to the magnetic meridian. For, let the plane 32… … Fig, 25, (hrum Watsons Textbook of Physics.) this plane, and Y at right angles to it, X being horizontal and Z vertical, X = H cos 8 = 1 cos 6 cos 8\ Y = H sin 8 = I cos 6 sin 8 Z = I sin 9.Y, being in the direction of the axle, will not exert any turning momentabout it, and the needle will…
Electricity · Magnetism
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