Abstract
II.
IN 1871 M. Jamin communicated to the French Academy of Sciences a short note by M. Gramme, on a magneto-electric machine which gave electrical currents always in the same direction by the revolution of an electro-magnetic ring between the poles of a permanent magnet. The construction of the electro-magnetic or ring armature in Gramme's machine differs in some mechanical details from that of the transversal electro-magnet of Pacinotti, and the serious mistake of applying the rubbers which carry off the current at the wrong place is avoided. We must therefore regard the Gramme machine as the first effective magneto-electric machine constructed to give continuous currents all flowing in the same direction. Before entering into the details of its construction it may be useful, even at the risk of some repetition, to describe as briefly as possible the principles on which the action of the electro-magnet or ring armature depends.
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Magneto-Electric Machines * . Nature 12, 130–132 (1875). https://doi.org/10.1038/012130a0
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DOI: https://doi.org/10.1038/012130a0