Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . uilibrium between these two forces,across the wire. It will be shown hereafter that acontinued rotation may be produced by confiningthe action to one pole. If the wire is movable andthe magnet fixed, the former will revolve around thelatter in a similar manner, and in the same a wire conveying a descending current tendsto rotate round the north pole of a magnet-j in thedirection of the hands of a watch. 52,. 98 Daviss manual. magnetic
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . uilibrium between these two forces,across the wire. It will be shown hereafter that acontinued rotation may be produced by confiningthe action to one pole. If the wire is movable andthe magnet fixed, the former will revolve around thelatter in a similar manner, and in the same a wire conveying a descending current tendsto rotate round the north pole of a magnet-j in thedirection of the hands of a watch. 52,. 98 Daviss manual. magnetic influence of the earth, as whatever forcesmay be exerted upon the upper needle will becounteracted by equal forces exerted in reverse di-rections upon the lov/er. It would be the same,indeed, with the influence exerted by the current oielectricity, if the wire could be placed in such aposition as to act equally on both needles. But byplacing the wire parallel to and above the upperneedle, the influence of the wire will be far morepowerful upon the upper than upon the lower one,and, the action of terrestrial magnetism being neu-tralized, the needle will assume a position exactlyat right angles with the conducting wire. If thewire be placed as nearly as possible between theneedles, and parallel to them, the influence of theupper side of the wire will deflect the upper needlein the same direction as the lower needle will bedeflected by the action of the lower side of the wire^causing a more powerful effect. 157. Magnetic Neeble, half brass. — In thisinstrumen
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
