Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . & in., at full load to ^ in., on short the rheostat arm will settle, the spark will 88 ELECTRICITY FOR ENGINEERS become constant, and the machine will give its propercurrent. Then clamp the rocker and rheostat-armtogether and let the machine regulate itself. This method is much better than opening theswitches on the machine and allowing the wall con-troller to take care of the machine from the start. Byallowing the controller to start the machine, a triflelonger spark is obtained
Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . & in., at full load to ^ in., on short the rheostat arm will settle, the spark will 88 ELECTRICITY FOR ENGINEERS become constant, and the machine will give its propercurrent. Then clamp the rocker and rheostat-armtogether and let the machine regulate itself. This method is much better than opening theswitches on the machine and allowing the wall con-troller to take care of the machine from the start. Byallowing the controller to start the machine, a triflelonger spark is obtained than by the other method, PULLEY END COMMUTATOR END. figure 48. unless the machine is run from the beginning on a veryfull load. The machine will require a trifle longer spark onlight load, or on bad circuits, than when running atfull load. This fact should be borne in mind in wetweather, when trouble with grounds is experienced. A reliable ammeter should always be connected inthe circuit of an arc generator, so that the exact cur-rent may be read at a glance. It should be connectedinto the negative side of the line where the circuitleaves the regulator. ELECTRICITY FOR ENGINEERS 89 The Thomson-Houston System. The Thomson-Hous-ton dynamo differs from other arc dynamos principallyin the nature of its armature winding. This is shownin Fig. 48. One end of each of the three coils is con-nected to a copper ring common to all. The other endof each coil terminates at one of the three commutatorsegments. The management and operation of themachine will appear from the following instructionstaken from pamphlets furnished by the General Elec-tric
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