. Electric railway gazette . each of which contains two copperconductors insulated from the slot and from each conductors are firmly locked in the slot by driving ina long wooden wedge above them, and the slots are liber-ally lined with fuller board and mica before the insertionof the bars, which are individually insulated with tape andmica. A section of a slot is shown in Fig. 1. FIG. 3—THE COMMUTATOR. are needed in which to wind the armature, one of whichis required for preparing and insulating the speed of the dynamo is but 75 revolutions perminute. The diameter of the
. Electric railway gazette . each of which contains two copperconductors insulated from the slot and from each conductors are firmly locked in the slot by driving ina long wooden wedge above them, and the slots are liber-ally lined with fuller board and mica before the insertionof the bars, which are individually insulated with tape andmica. A section of a slot is shown in Fig. 1. FIG. 3—THE COMMUTATOR. are needed in which to wind the armature, one of whichis required for preparing and insulating the speed of the dynamo is but 75 revolutions perminute. The diameter of the armature is 10 feet 6 inches, and itsweight, with commutator, approximately 40 tons The com-mutator, which is shown by Fig. 3, is a splendid piece ofwork, 20 inches across the face and 7 feet in clearance of the armature will be about % inch. Thearmature is multiple-wound, and twelve sets of brushesare to be employed. The field magnet is to be of caststeel. A general view of the set is shown in Fig. 4; it is. FIG. 2.—CONNECTOR SYSTEM. The spiral method of connection is used on thismachine, as shown in Fig. 2. The bars are usuallyinserted carrying the front connector already soldered on,and the rear connector is attached after the bar has beenlo:ked in position. The machine has twelve poles andtherefore the connectors partake very little of the spiralform, being only slightly curved. The rectangular copperbars are jl inch by ^|inch, and are fastened to the con-. FIG. 4—VIEW OF COMMUTATOR END OF ARMATURE. interesting from a mechanical as well as an electrical pointof view. The Allis cross-compound engine takes steamat 180 pounds, and expands in two cylinders 32 and 62inches in diameter respectively. The stroke is 60 73-ton fly-wheel is 24 feet in diameter and has a cir-cumferential speed of 5655 feet per minute. It is, how-ever, substantially built to withstand this stress, beingmade up of 19 i-inch wrought-iron plates. The second 446 ELECTRIC RAILW
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
