. Electric railway journal . d necessary. Some-times extensive excavation is necessary before even twojacks can budge them. The jacks are seen in the cut to face opposite are thus placed so that the ratchet releases maybe on the outside and accessible for repeated use as thechain is lowered in the progress of the pole raising. Reducing the Bore of a Gear by Meansof the Electric Arc BY JOHN B. BLACKLOCK Master Mechanic Atlantic Citv & Shore Railroad,Atlantic City, N. J. The accompanying illustrations show a job per-formed in the shops of the Atlantic City & ShoreRailroad in which the
. Electric railway journal . d necessary. Some-times extensive excavation is necessary before even twojacks can budge them. The jacks are seen in the cut to face opposite are thus placed so that the ratchet releases maybe on the outside and accessible for repeated use as thechain is lowered in the progress of the pole raising. Reducing the Bore of a Gear by Meansof the Electric Arc BY JOHN B. BLACKLOCK Master Mechanic Atlantic Citv & Shore Railroad,Atlantic City, N. J. The accompanying illustrations show a job per-formed in the shops of the Atlantic City & ShoreRailroad in which the bore of a large wormwheel wasreduced about 1/16 in. This reduction was consideredtoo small to permit the satisfactory use of a bushing, sowe resorted to welding, with the result as shown. Theoriginal bore was 3x/2 in. and the hub 8 in. long. Afterboring the gear was pressed on the shaft with a forceof 15 tons. In this and other welding jobs performed in the com-panys shops a water rheostat is used to control the cur-. WORMWHEEL WITH NEW METAL WELDED IN BORE, BEFORE ANDAFTER RE-BORING 370 ELECTRIC RAILWAY JOURNAL [Vol. XLVII, No. 8 rent and trolley voltage is used. The water rheostatwas mentioned in the issue of the Electric RailwayJournal for July 3, 1915, page 24. In the testing cor-ner of the shops is the switchboard illustrated in con-nection with the article and directly below it is a barrelfilled with brackish water. An iron plate suspended inthe water, forming one terminal of the rheostat, is con-trolled in position by a handwheel on the other terminal is a ground plate in the barrelbottom. The welding current flows through a circuit breaker,an ammeter and a knife switch to the welding handle,and the suspended plate is electrically connected to thearticle to be welded. For all ordinary work the rheo-stat gives no trouble, although on a heavy job taking,say, thirty minutes, the water becomes quite hot. Simple Method of Graphically Deter-mining Air-Brake Lev
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