Roper's catechism for steam engineers and electricians .. (1899)
Roper, Stephen. [from old catalog], Keller, Edwin R., [from old catalog] ed, Pike, Clayton W., [from old catalog] ed · Philadelphia, D. McKay · leaf 277
re is the mag-netic force greatest ? A. Next to the wire, asshown by the greater den-sity of the lines of force.Q. Suppose the currentthrough the wire were greatly increased, howwould the density of the lines be affected ? A. It would be increased in the same proportionas the magnetic effect of the… … STEAM ENGINEERS AND ELECTRICIANS. 257 A. Yes; they will move in such a way that thegreatest possible number of lines of force due tothe magnet will pass through the coil. Q. For what practical purpose can this principleof the effect of an electric current on a magnet beused ? A. AYe can detect…
Steam engineering · Electrical engineering
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