Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 437
70, and he did this by means of a machine, a diagram ofwhich you can see on the board here. This is only a rough diagramshowing the principle of the machine. (Fig. 8.) Here is the north pole of the field-magnet, marked iV, and hereis the south pole, marked /S. These are magnetized by coils… … Fig. 8.—Diagram of Gramme machine (series wound), showing field-magnet and pole pieces, ring armature, commutator, and direction ofcurrents. The armature rotates with the hands of a watch. magnet and the poles in the ring retain the same position in space whilethe ring revolves. As soon as the ring…
Science · Technology · Meteorology · Patents
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