. The street railway review . ehem Steel outside diameter of the commutator is 8 ft. 9 field magnet frame is of cast steel and provided with handholes. The poles are of laminated wrought iron and bolted intothe frame, the baudholes giving easy access to the bolts which hold the poles in pl;icc, .\t a normal load this generator is designed logive an output of 4,500 amperes at 600 volts, or sunicieiil lo operate300 loaded street cars. The condi using plant of this engine is of special interest, as itdispenses with the usual air pump rcquircil with condensing en-gines, and forms and
. The street railway review . ehem Steel outside diameter of the commutator is 8 ft. 9 field magnet frame is of cast steel and provided with handholes. The poles are of laminated wrought iron and bolted intothe frame, the baudholes giving easy access to the bolts which hold the poles in pl;icc, .\t a normal load this generator is designed logive an output of 4,500 amperes at 600 volts, or sunicieiil lo operate300 loaded street cars. The condi using plant of this engine is of special interest, as itdispenses with the usual air pump rcquircil with condensing en-gines, and forms and maintains its vacuum entirely by the use ofthe exhaust steam and the condensing water. The apparatus con-sists of two of the well-known Bulkley injector-condensers, at-tached by angle elbows to the main exhaust pipe, each condenserbeing 24 in. in its exhaust opening. The exhaust steam enters ahollow cone of moving water, at the upper part of the condenser,and in condensing imparts to it a velocity that it enables it to carry. FIG. 28 BULKLEY CONDENSER. out the air and vapor into the enlarged portion of the condenserbelow. The condensers are each connected with the hot-well belowby air-tight water discharge pipes, of sufficient length to allow thewater to be delivered by gravity against the pressure of the at-mosphere. They are both supplied with water by a centrifugalpump operated by an electric motor, which takes its supply of saltwater from the Bay. and after the vacuum is formed the water iselevated about 25 ft. by atmospheric pressure, thus giving the pumpvery little work to do. Either or both condensers may be used,according to the load on the engine and temperature of the water,and a very high vacuum is thus maintained as long as the water sup-ply is kept up. The automatic relief valves at the top. will allow theengine to work non-condensing the instant the vacuum is lost from 186 STREET RAILWAY REVIEW. [Vol. X, No. 4. any cause. In many instances a natural head of water
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
