The Philosophical magazine; a journal of theoretical, experimental and applied physics . and 20 centims. ofcopper wire 2*07 millims. in diameter, and the ten large Smeeselements, the iron spiral became nearly red-hot; at the first in-stant of passage of the current the iron repelled the similar poleof the needle somewhat more strongly than the cold copper; butas it became hot its excess of repulsion became less. I now sub-stituted twelve Groves cells (of the size already mentioned) as adouble series of five for the Smees battery: the iron wire be-came red-hot, whilst the copper one remained co
The Philosophical magazine; a journal of theoretical, experimental and applied physics . and 20 centims. ofcopper wire 2*07 millims. in diameter, and the ten large Smeeselements, the iron spiral became nearly red-hot; at the first in-stant of passage of the current the iron repelled the similar poleof the needle somewhat more strongly than the cold copper; butas it became hot its excess of repulsion became less. I now sub-stituted twelve Groves cells (of the size already mentioned) as adouble series of five for the Smees battery: the iron wire be-came red-hot, whilst the copper one remained cold, and the needleremained about equidistant between the two helixes. With aflat helix of thin platinum wire substituted for the one of ironthe platinum one became nearly white-hot, and appeared to repelthe needle a little more than the copper; it is difficult, however,to make the spirals perfectly uniform, and to exactly determinethe middle point between them. Experiment 5.—In this experiment no needle was flat spirals (A and B, fig. 4), about 18 centim. in diameter,. Mr. G. Gore on the Magnetism of Electrodynamics Spirals. 267 composed of thin iron wire Fig. 4. 15 centims. long, and eacli ofthesamethickness,were taken,and one of them freely sus-pended (by means of the twofibres C, C) vertically andfacing the other at a distanceof about 2 or 3 millims. lower ends of the spiralsdipped into two small cups ofmercury to enable the con-nexions to be made with free-dom of motion to the sus-pended one; and the similarpoles of the spirals faced eachother. The current from thetwelve Groves cells in singleseries was passed throughthem; they immediately re-pelled each other and then melted. The same current was nowpassed through two similar ones IG centim. in diameter, com-posed of thicker iron wires, each 12 centims. long and 95 mil-lim. thick; they repelled each other most distinctly aud stronglywhilst warm, and also whilst quite red-hot, and the moveable onein
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