. Electric railway journal . evolutionwere obtained. The revolving weight on the bearings of each of theengines was 439,000 lb., and an allowance of 70,000 was made to provide for magnetic pull betweenfield magnet and armature. The shaft itself weighed63,000 lb. On account of the great mass of the revolv-ing field magnet it was possible to dispense with theflywheel, a notable advance in slow-speed generating-unit design. To these engines was later added a 7500-kw Westinghouse turbine unit. The engines exhausted into Worthington jet con-densers with triplex motor-driven circulating pump
. Electric railway journal . evolutionwere obtained. The revolving weight on the bearings of each of theengines was 439,000 lb., and an allowance of 70,000 was made to provide for magnetic pull betweenfield magnet and armature. The shaft itself weighed63,000 lb. On account of the great mass of the revolv-ing field magnet it was possible to dispense with theflywheel, a notable advance in slow-speed generating-unit design. To these engines was later added a 7500-kw Westinghouse turbine unit. The engines exhausted into Worthington jet con-densers with triplex motor-driven circulating were changed, about 1903, to the barometric type. The boiler house consisted of a basement, two boilerfloors and a row of coal bunkers, the height from thebasement to the top of the monitor being 128 ft. Thebasement was divided into three longitudinal compart-ments for the purpose of protecting the pumps fromthe dust produced by the ash-handling machinery. Oneach boiler floor were thirty-two B. & W. boilers, with. INTERBOROUGH POWER PLANT—FIG. 5—CROSS-SECTION OFENGINE ROOM AFTER REMODELING Roney stokers, each rated at 520 nominal horse-powerand containing 5200 sq. ft. of heating surface. Thesewere arranged in batteries of two, eight boilers to anengine, the whole forming a generating unit. Theboiler house was provided with four Custodis brickstacks of 17-ft. flue diameter at the top and 18 ft. atthe bottom, 278 ft. high above the basement floor, thetallest stacks of the kind constructed in this countryto that time. A Green economizer was provided for each four boilers, as it was deemed necessary to havethese to heat the feed water, all of the auxiliaries beingelectrically driven. Each unit was served by an elec-trically-driven Goulds triplex boiler feed pump. Abovethe boiler floors was a row of three coal bunkers, sep-arated by 35-ft. spaces for fire protection, having atotal capacity of 7500 tons, a ten-day supply. The building housing this plant, seen in Fig. 1, e
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