. The street railway review . holder. Each one consists of four sets of copper leaveswhich carry the current and control the movement of the brushfrom or toward the commutator, always maintaining the sameangle with its surface, so that they wear away evenly. .As theyliecunie shorter they may be extended and clamped in a newpositicm without altering the surface of contact. A helical springregulates the brush pressure and since it carries no current, is notinclined to beat and vary its tension. The brush-holder arms areiiulcpendently adjustable to conpensate for any inequalities amongthe magneti
. The street railway review . holder. Each one consists of four sets of copper leaveswhich carry the current and control the movement of the brushfrom or toward the commutator, always maintaining the sameangle with its surface, so that they wear away evenly. .As theyliecunie shorter they may be extended and clamped in a newpositicm without altering the surface of contact. A helical springregulates the brush pressure and since it carries no current, is notinclined to beat and vary its tension. The brush-holder arms areiiulcpendently adjustable to conpensate for any inequalities amongthe magnetic circuits, and when the various circuits are in equi-librium, to secure the position of sparkless commutation, the entirenicker ring may be revolved by the hand wheel. Current for the incandescent and arc lighting is furnished bybelt-driven inachines located in the northern half of the incandescent lighting there are two General Electric two-phase(lo-cycle 2,300-volt compensated revolving field type of KNU VIIOW OF (WR One of 150 kw. capacity is driven with a speed of 600 r. p. m. bya 225-h. p. 16^ X 18-in. simple horizontal Buckeye engine, runningat 225 revolutions per minute. The other has a capacity of tookw., running at gco r. n. m., and is driven by a I4i x i6-in. Buck-eye engine rated at 150 h. p. at 240 r. p. m. l-rom the same enginea I20-Iight Brush arc dynamo is driven at 500 r. p. m., a frictionclutch on the shaft jf the engine being used to disengage eithermachine while allowing the other to run. The remainder of the arclighting includes two 120-light Hru^ll machines both Feb. jo. igo4.) STREET RAILWAY 99 driven at 500 r. p. m. by an 18 x 20-in. simple liorizomal Clarkengine, having a capacity of 300 h. p. at 175 r. p. ni., and a WesternElectric iJ5-liglit arc dynamo driven at 525 r. p. m, by a 14 x engine rated at 125 li. p. at 240 r. p. m. All the lightingengines are supplied with steam at a pressure
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
