. The Street railway journal . field frame is ofsteel castings, divided horizontally througharmature and axle bearings. A liberal centerdistance is allowed between these bearings sothat a maximum axle of 6 ins. in diameter may be pole pieces are of laminated iron secured to the frame withthrough bolts. There are four poles, each provided with acoil, which is securely held in place by the projecting tips ofthe pole pieces. The pole pieces are provided with ventilating about % in. The brush holders are of cast brass secured to aspecially treated wood block. This block is in turn bolted
. The Street railway journal . field frame is ofsteel castings, divided horizontally througharmature and axle bearings. A liberal centerdistance is allowed between these bearings sothat a maximum axle of 6 ins. in diameter may be pole pieces are of laminated iron secured to the frame withthrough bolts. There are four poles, each provided with acoil, which is securely held in place by the projecting tips ofthe pole pieces. The pole pieces are provided with ventilating about % in. The brush holders are of cast brass secured to aspecially treated wood block. This block is in turn bolted tothe end of the upper field frame fitting an accurately babbittedseat. Each holder is secured to its block independently of theother, and carries two carbon brushes; an independent pres-sure finger is provided for each brush. The bearings are ofcast iron with babbitt lining. The pinion end armature bear-ing is 3^2 ins. in diameter and gYz ins. long, and the commuta-tor bearing is 3 ins. in diameter and 7% ins. long. The axle.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
