. The Street railway journal . ved,even though they were in perfect condition, in order to getat the faulty ones. Various methods of winding the coils in groups wereused, so as to equalize in a measure their length and re-sistance, and thereby avoid the commutator troubles 126 STREET RAILWAY JOURNAL. [ XIV. No. 3. to which such electric unbalancing gave rise. As suchsurface-wound armatures as this are now universally dis-carded, it is not necessary to describe their length, but what has been said is of interest, because itpoints out how the railway armature has been improv
. The Street railway journal . ved,even though they were in perfect condition, in order to getat the faulty ones. Various methods of winding the coils in groups wereused, so as to equalize in a measure their length and re-sistance, and thereby avoid the commutator troubles 126 STREET RAILWAY JOURNAL. [ XIV. No. 3. to which such electric unbalancing gave rise. As suchsurface-wound armatures as this are now universally dis-carded, it is not necessary to describe their length, but what has been said is of interest, because itpoints out how the railway armature has been improved. The Short motor and the W. P. 50 and 30 motors of theThomson-Houston Company pretty effectually demon-strated that a toothed armature was eminently superiorfor railway work. A core covered with slots was verymuch easier to wind than a smooth body armature, forthe wire was very much less likely to become was discovered about this time that an armature coilcould be formed up separately and slipped on to the core. FIG. 4.—EARLY FORMED COIL WINDING provided that a drum construction was used. Of coursering armatures inevitably demanded hand winding witha shuttle. This system of formed coils had many attrac-tions. Cheap labor could be employed in winding them,for they were not difficult to construct and it is alwayseasy to perfect even an uninformed laborer in the con-struction of a simple member, and if he has to make hun-dreds of these he will soon become more expert than hisinstructor. Besides these advantages the formed coils
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
