. The Street railway journal . rent for the signaloperating magnets, is supplied by eight groups of storage-bat-tery sets in duplicate, each set designed to deliver 16 volts,located at convenient points in the subway, usually in signaltowers. Each battery has a capacity of , andthe two sets at each battery station are operated alternately,one being charged while the other is discharging. The bat-teries are charged by small motor generators, driven by cur-rent from the 600-volt direct-current propulsion system, one terestingly worked out. A pressure gage operating uponthe Bourdon
. The Street railway journal . rent for the signaloperating magnets, is supplied by eight groups of storage-bat-tery sets in duplicate, each set designed to deliver 16 volts,located at convenient points in the subway, usually in signaltowers. Each battery has a capacity of , andthe two sets at each battery station are operated alternately,one being charged while the other is discharging. The bat-teries are charged by small motor generators, driven by cur-rent from the 600-volt direct-current propulsion system, one terestingly worked out. A pressure gage operating uponthe Bourdon steam gage principle is arranged to makedifferent contacts for certain maximum and minimumpressures, as shown upon the switchboard. When thepressure tails so as to close the upper contact, cur-rent is delivered to an .automatic switch, which operatesa mechanism in such a w ay as to move the starting resistanceswitch for the air-compressor driving motor. This mechanismis so arranged that when the starting1 resistance is cut en-. A TYPICAL ELECTRO PNEUMATIC INTERLOCKING MACHINE, LOCATED UPON A STATION PLATEORM, FOR THE OPERATION 1 CROSS-OVER SWITCHES being located at each storage-battery point. They deliver tothe storage batteries at 25 volts potential. The compressed-air supply for the various signal mechan-isms and switches, the automatic car stop, etc., is supplied bya 2-in. main extending the length of the system. This main isfed by six 35-hp electrically-driven compound air-compressors,one of which is located in each of the following sub-stations:Nos. ir, 12, 13, 14, 16 and 17; three of these are reserve are driven by Westinghouse direct-current motors, takingcurrent from the direct-current bus-liars at the sub-stations atfrom 400 volts to 700 volts. These compressors have each acapacity of 230 cu. ft. of free air per minute, delivered into thesupply system at a pressure of from 60 lbs. to 75 lbs. per squareinch. These compressors are each automatically controlled
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
