Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 590
sscurrents being induced in the magnets, to rnaintain the lines ofmagnetic force parallel to the length of the bar, and to permitof a circulation and escape of air between the revolving arma-ture and the magnets, so as to reduce the accumulative heatingof the machine. Of the curved portions of the… … Fig. 367. sequent point or pole in the centre of their length, a north polebeing produced in the upper set of magnets and a south polein the lower. Thus a very intense magnetic field is formed within thecylindrical space included between the upper and lower sets ofmagnet bars, and within this space…
Electrical engineering
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