. The railroad and engineering journal . METHOD OF WINDING SIEMENS ARM.\TURE. The superiority of the very constant current generatedby the Gramme machine was so palpable that Siemenswas not slow in appreciating it, and we soon find himbringing forward a machine in which, while the long ar-mature is preserved, the single coil with its two-partcommutator is replaced by a cylinder longitudinally woundwith many coils which, like the Gramme coils, do notoverlap each other but lie on different parts of the circum-ference, are connected to each other around the whole cir-. ^^ cumference, and are conn
. The railroad and engineering journal . METHOD OF WINDING SIEMENS ARM.\TURE. The superiority of the very constant current generatedby the Gramme machine was so palpable that Siemenswas not slow in appreciating it, and we soon find himbringing forward a machine in which, while the long ar-mature is preserved, the single coil with its two-partcommutator is replaced by a cylinder longitudinally woundwith many coils which, like the Gramme coils, do notoverlap each other but lie on different parts of the circum-ference, are connected to each other around the whole cir-. ^^ cumference, and are connected also to an equal numberof brass strips secured to the armature shaft. Fig. 12shows a new Siemens armature in process of construction,one coil only being in place, and fig. 13 shows a new Siem-ens machine, the armature with all its coils on, lying inposition between the magnet pnles. In what has been said thus far. it has been assumed that 553 THE RAILROAD AND the field magnets were permanent magnets, or, at le;ist,were not dependent for their magnetism upon the ma-chine itself. Small dynamos are sometimes so made, andformerly all dynamos were; but now nearly all field mag-nets are electromagnets produced and maintained by thearmature revolving between their poles, as in tig. 14. Whenthe armature is motionless, and therefore making no cur-rent, no magnetism is evident in the field magnets, except Fig. 14.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
