Find number abc
If 95b1a - 4cba9 = 519bc find number abc. Multiple solutions may exist.Correct answers: 38
The first user who solved this task is Djordje Timotijevic.
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Electric motorIn 1904, the first direct current, interpole, electric motor to be patented in the U.S. was issued to Mathias Pfatischer of Phildadelphia, Pennsylvania under the title "Variable Speed Motor" (No.775,310). His improvement was to "effect commutation without sparking, with a variable load as well as at variable speed and which is capable of rotation in either direction." The new design added auxiliary-field pole-pieces which were small as compared to the main pole-pieces.« |