. The street railway review . of 208 STREET RAILWAY REVIEW. [Vol. XI, No. 4- cylinders, 26 and 50 in.; length of stroke, 48 in.; speed, r. p. m.,100; diameter of balance fly-wheel, 18 ft.; weight of balance fly-wheel, 120,000 lb.; diameter of shaft at middle, 24 in.; dimensions 01main bearings, 22 x 38 in.; dimensions of crank pin, SA x SlA in.;dimensions of crosshead pin, 7 k Syi in.; length of connectingrod, c. to c, 12 ft. Cylindrical gridiron valves without false seats are used, the areaof the inlet and exhaust parts being 10 per cent of the piston terminals, the pressure at full loading b
. The street railway review . of 208 STREET RAILWAY REVIEW. [Vol. XI, No. 4- cylinders, 26 and 50 in.; length of stroke, 48 in.; speed, r. p. m.,100; diameter of balance fly-wheel, 18 ft.; weight of balance fly-wheel, 120,000 lb.; diameter of shaft at middle, 24 in.; dimensions 01main bearings, 22 x 38 in.; dimensions of crank pin, SA x SlA in.;dimensions of crosshead pin, 7 k Syi in.; length of connectingrod, c. to c, 12 ft. Cylindrical gridiron valves without false seats are used, the areaof the inlet and exhaust parts being 10 per cent of the piston terminals, the pressure at full loading being 400 volts. The powerfactor is 90 per cent. These machines are excited by a direct current at 125 volts. Thearmatures are star connected and are of the slotted drum type,the cores being built of laminated steel. The windings consist ofbar wound coils formed and insulated before being placed in thearmature slots. Throughout the armature spider, core and wind-ings, large ventilating ducts are provided, and the design of the. -BOOSTER, RdTARV CONVKRTEKS .\ND SWITCHBOARDS. area. The governor is of the improved Rites inertia type, givinga cut-off variable from o to J4 stroke. The fly-wheel is in segmentswith oval arms each arm being cast in one with a piece ofthe rim; the joints are made with arrow-head steel keepers shrunkin Hush with the rim. The engines are piped for a gravity lubricating system. The en-gine oil is returned to Turner filters in the basement and isthence pumped to the storage tank. The engine room has a 2S-tontraveling crane made by Pawling & Harnishfeger, of Milwaukee. All of the electrical apparatus was furnished by the Westing-house Electric & Manufacturing Co., excepting the booster units,the storage batteries and some switchboard panels. The three
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