[Electric engineering.] . ecarried to the switchboard. The connections for the shuntwinding and the shunt-field rheostat are made by means ofthe small terminals s, s. When two or more machines arerun in multiple, a third main connection is led from the ter-minal E to the equalizing bar on the switchboard. Themachine shown has a capacity of 260 kilowatts, runs at500 revolutions per minute, and weighs a little over 9 tonscomplete. Belt-driven machines are smaller and cheaperfor the same output than direct-connected machines, becausethey run at a higher speed. Notwithstanding this fact, thedirect
[Electric engineering.] . ecarried to the switchboard. The connections for the shuntwinding and the shunt-field rheostat are made by means ofthe small terminals s, s. When two or more machines arerun in multiple, a third main connection is led from the ter-minal E to the equalizing bar on the switchboard. Themachine shown has a capacity of 260 kilowatts, runs at500 revolutions per minute, and weighs a little over 9 tonscomplete. Belt-driven machines are smaller and cheaperfor the same output than direct-connected machines, becausethey run at a higher speed. Notwithstanding this fact, thedirect-connected type is becoming very popular, especiallyin places where economy of space and compact arrangementare desired. 93. Direct-Connected Dynamos. — By using direct-driven machines, all wear and tear on belts is avoided anda large saving in space effected. Fig. 50 shows a com-pound-wound dynamo made by the Fort Wayne ElectricWorks direct connected to a high-speed engine, and is a/. III.—18 84 ELECTRIC LIGHTING. 16. § 16 ELECTRIC LIGHTING. 85 typical example of a multipolar .direct-driven set. Such acombination is largely used for isolated plants and also forcentral stations of moderate size. For larger stations it iscustomary to use slow-speed engines of the Corliss typedirect connected to large multipolar dynamos. The dynamo,Fig. 50, is mounted upon an extension bedplate A providedwith an outboard bearing B. This machine is compound-wound, a, a being the leads connecting to the terminals ofthe series coils; C and D are the mains running to theswitchboard; the leads from the brushes are attached to theconnection boards, one of which is shown at F. The termi-nal for the equalizing wire is shown at G. The smallleads h, h are connected to the shunt winding and are ledto the switchboard so that the field rheostat may be con-nected in series with the shunt field. The hand wheelsshown at W are for adjusting the brushes to the non-sparking point and clamping them in position.
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