Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 1060
he compass, or upon iron filings. It is by virtueof the field of force that every dynamo electric generator,and every electric motor works. A needle held near amagnet is attracted because of the field of force. In thecase of the mariners compass, the needle is influenced bythe earths field of… … LINES OF FORCE SURROUNDING AN ACTIVE CONDUCTOR erator, produces currents and potential capable of doingwork of various kinds. We can thus see that the electriccurrent in its effects is a very real and tangible thing,although in theory it is somewhat imaginary. The mag-net is the most familiar…
