Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . f the whirls is re-versed and the lines now emanate from the nearer or N-faceof the loop, and enter by the more distant S-face. The po-larity of the loop is, therefore, reversed as compared with theprevious case. The aboveprinciples may be demon-strated by Exp. 53. // Exp. 53: Fasten a piece ofcopper and zinc to a large cork, s*Connect the plates by a circular i\turn of heavy wire, Fig. 143, Vand immerse them in a jar con-taining dilute sulphuric a bar magnets S-poleto t
Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book . f the whirls is re-versed and the lines now emanate from the nearer or N-faceof the loop, and enter by the more distant S-face. The po-larity of the loop is, therefore, reversed as compared with theprevious case. The aboveprinciples may be demon-strated by Exp. 53. // Exp. 53: Fasten a piece ofcopper and zinc to a large cork, s*Connect the plates by a circular i\turn of heavy wire, Fig. 143, Vand immerse them in a jar con-taining dilute sulphuric a bar magnets S-poleto the N-face of the turn in thedirection of its axis; the coilwill be attracted, and carryingthe cell with it, move along themagnet till it reaches the mid-dle point, or equator. Thefigure also illustrates the direc-tion of the currents and mag-nets magnetic lines. The lawsof attraction and repulsionshould be verified and sketchesmade. 174. The Helix and Solenoid.—A coil of wire wound soas to follow the outlines of a screw without overlaying itselfis termed a helix. Fig. 144, and may be wound right or left-. Fi£ 143.—Testing the PolaritySingle Turn of Wire. of a The turn is connected to a floating batteryand is free to move. ELECTR OMA GNETISM. 163
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