. American engineer and railroad journal . of which is 4,000 feet, isthrough Beekman street to William, to South William, to Broad,to Stone and thence to the Exchange. The power used fortransmission is compressed air at a comparatively low is supplied by the Rand improved duplex air compressor,built by the Rand Drill Company, of 100 Broadway, NewYork City, and is located in the basement of the PostOffice. The compressur needs no detail description, as it doesnot differ materially from air compressors of the Rand typebuilt for other purposes. The stroke is 20 inches, the diametero
. American engineer and railroad journal . of which is 4,000 feet, isthrough Beekman street to William, to South William, to Broad,to Stone and thence to the Exchange. The power used fortransmission is compressed air at a comparatively low is supplied by the Rand improved duplex air compressor,built by the Rand Drill Company, of 100 Broadway, NewYork City, and is located in the basement of the PostOffice. The compressur needs no detail description, as it doesnot differ materially from air compressors of the Rand typebuilt for other purposes. The stroke is 20 inches, the diameterof the steam cylinders 10 inches and the air cylinders 24 air at a pressure of six or eight pounds per squareinch is stored in a tank from which it flows to the sending appa-ratus, situated on the floor above the compressor. From here theair is sent through the outgoing tube to the Produce Exchange,from whence it flows bick through the return tube to the PostOffice, passing through the receiving apparatus and into a Sending and Receiving Apparatus. in carriers by means of compressed air. Carriers may fallowone another at intervals of about six seconds, which experienceindicates is the time required to avoid contact. In the line opened between the Post Office and the ProduceExchange and which was successfully tested and set in operationOct. 7th, the lubes are of bored cast iron, twelve feet in have bells cast upon one end in order to join the sectionswith lead and oakum calked in the usual manner of makingjoints in the water and gas pipes, except that at the bottom of thebell a counter bore is turned to receive the finished end of thenext section. By thus machining the ends a practically con-tinuous tube with noshoulders is formed. A mandrel 18 inches inlength and 8g*j inches in diameter at the center tapering to eightinches at the ends is run through on completion of each pipe is laid in trenches from two to six feet below the pave
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
