. The Street railway journal . FIG. 1.—NEW TYPE OF GATE ture journal owing to wear on the journal. The shells arepoured over a core, and then bored out in a lathe. A specialchuck, which is clamped over the whole length of the shell,and which requires no special centering, is used for holdingthe shell while it is being bored out. As a small amount ofplay in an armature, when new, reduces the clearance somaterially (in practice it will sometimes reduce it one-half),and as this reduction of clearance so reduces the length oftime an armature can safely be run as to call for more fre-quent renewals
. The Street railway journal . FIG. 1.—NEW TYPE OF GATE ture journal owing to wear on the journal. The shells arepoured over a core, and then bored out in a lathe. A specialchuck, which is clamped over the whole length of the shell,and which requires no special centering, is used for holdingthe shell while it is being bored out. As a small amount ofplay in an armature, when new, reduces the clearance somaterially (in practice it will sometimes reduce it one-half),and as this reduction of clearance so reduces the length oftime an armature can safely be run as to call for more fre-quent renewals, Mr. Tarkington considers that the extrawork of boring out shells is fully paid for in assurance oflonger life and safety from armatures hitting pole pieces. FIG. 2.—CAR OF NORTHWESTERN ELEVATED RAILWAY arc usually a number of accidents on an elevated road, dueto efforts of passengers to board the train after it hasstarted and the gates have been closed, or to get off undersimilar circumstances. That such accidents are no
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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
