. Electric railway journal . m-ber of differences between itand the standard type of Pea-cock brake. The same spiralchain drum and gearing is em-ployed, but the chain drum issupported under a yoke whichis bolted to a separate castingmounted under the platformfloor. The bearing casting con-tains the roller bearing for thebrake shaft and a shaft androller bearing on which thebrake drum revolves. The yokeforms a step bearing for thebrake drum and is attached tothe upper casting by two entire brake can be dis-mantled by removing these twobolts and dropping the yoke, whereas in the Peacoc
. Electric railway journal . m-ber of differences between itand the standard type of Pea-cock brake. The same spiralchain drum and gearing is em-ployed, but the chain drum issupported under a yoke whichis bolted to a separate castingmounted under the platformfloor. The bearing casting con-tains the roller bearing for thebrake shaft and a shaft androller bearing on which thebrake drum revolves. The yokeforms a step bearing for thebrake drum and is attached tothe upper casting by two entire brake can be dis-mantled by removing these twobolts and dropping the yoke, whereas in the Peacock brakethe brake drum is enclosed in the yoke, which is integralwith the main casting and secured to the platform adjustable feature of the new brake consists in themeans provided for shifting the yoke to either side of thebrake shaft pinion so as to permit the brake chain to beled off the drum from either side of the rear leg of theyoke. The new brake has been patented in the UnitedStates and in foreign Adjustable Hand Brake 4o ELECTRIC RAILWAY JOURNAL. [Vol. XXXIII. No. i. COMBINATION FIRE AND WATER-TUBE BOILER The accompanying engravings illustrate the constructionof the Hawkes boiler, which is a combination of the hori-zontal return-tubular and the water-tube types. Thelower or water-tube member consists of two rows of watertubes, the upper row connecting into a front water-saddleat the forward end of the tubular boiler and with the waterleg at the rear. These tubes are covered with a special tileor split firebrick on the top, and form a covering or roofover the furnace, preventing the hot gases from comingin contact with the shell of the tubular member. Thewater tubes in the lower row connect the rear water-legwith a series of steel box-headers at the front end, whichare in turn connected to the front head and saddle bymeans of independent arch or circulating tubes. The upper tubular boiler is made of 6o,ooo-lb. tensile-strength flange steel, the rive
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