The Philosophical magazine; a journal of theoretical, experimental and applied physics . 8 centims. long, was suspended in the di-rection of north and south (by means of a fibre about 35 or 40centims. long), with its south pole between and equidistant fromthe ends of the tsvo coils, which were about 3 centims. asunder;the needle was weighted at its centre by a little piece of of the wires was coiled in the direction of a right-handed,and the other of a left-handed screw, so that on passing the cur-rent through them the magnetism excited in their ends nearestto the needle was of the sa
The Philosophical magazine; a journal of theoretical, experimental and applied physics . 8 centims. long, was suspended in the di-rection of north and south (by means of a fibre about 35 or 40centims. long), with its south pole between and equidistant fromthe ends of the tsvo coils, which were about 3 centims. asunder;the needle was weighted at its centre by a little piece of of the wires was coiled in the direction of a right-handed,and the other of a left-handed screw, so that on passing the cur-rent through them the magnetism excited in their ends nearestto the needle was of the same kind; and the direction of thecurrent was such that the poles of the wires were of the samekind as that of the nearest end of the needle. With ten Grovescells as one series, the platinum plates of which were 165 cen-tims. long and 77 centims. wide, the platinum wire became veryhot, but not red-hot, whilst the copper wire remained cold; theneedle remained equidistant between the two wire poles, beingequally repelled by the hot platinum and cold copper. * Communicated by the Mr. G. Gore on the Magnetism of Electrodynamic Spirals. 265 Experiment 2.—In this experiment the spirals were 1-5 cen-tim. in diameter and 2*9 centims, long,and were placed parallel to each other,as in fig. 2, and were formed of platinumwire -82 millim. thick, and copper wire2-05 millims. thick; but in other re-spects the arrangements were similar tothose of No. 1 experiment. With theten Groves cells as one series the pla-tinum wire was quite red-hot through-out, and the copper wire cold, and thepole of the needle remained equally re-pelled by each spiral as before; andwith the cells as a double series of five,the platinum wire was bright red-hotand the needle remained in the centrethe same as if no current was bright red heat, therefore, did notsensibly increase or decrease the mag-netizing influence of the platinum spiral-and the magnetism of that spiral wasindependent of change of l
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