I.C.S. reference library : a series of textbooks prepared for the students of the International Correspondence Schools and containing in permanent form the instruction papers examination questions, and keys used in their various courses (1904)
International Correspondence Schools · Scranton : International Textbook Co. · leaf 408
e attraction of some adjacent mag-net. When a current of electricity passes around the coil,its tendency is to deflect the magnetic needle at rightangles to its original position, as explained in Art. 25,while the tendency of the earths magnetism is to oppose themovement. The couplethereby produced… … Fig. ai. greater the deflection. With a 30 ELEMENTS OF §8 galvanometer of standard dimensions and a magnetic field ofknown strength, such as the earths magnetism at a conve-nient place on its surface, a strength of current can be con-ventionally adopted as a unit Avhich will produce a…
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