. The street railway review . on at all times. This system isshown in Hig. i, and is virtually ciimi)osed of numerous stations,lacli complete in itself, and means for connecting them into a collectivc plant when desired. This is the only .system tluit will permitnpairs or shut down of any portion of the plant and at the same tin- cros> conneciions occasion more difficulties and shut downs thanwould the machine for which cross connections have been 2 shows a divided station, necessitating the use of certain sec-lions of mains in order to operate the plant. With this system, ast
. The street railway review . on at all times. This system isshown in Hig. i, and is virtually ciimi)osed of numerous stations,lacli complete in itself, and means for connecting them into a collectivc plant when desired. This is the only .system tluit will permitnpairs or shut down of any portion of the plant and at the same tin- cros> conneciions occasion more difficulties and shut downs thanwould the machine for which cross connections have been 2 shows a divided station, necessitating the use of certain sec-lions of mains in order to operate the plant. With this system, astation of say si.\ units, may be divided into three distinct parts,each operative throughout and wholly independent of the system costs much less than No. I and requires but two auxiliaries of each kind for the entire plant. This system is suitableonly for such inslallalions as are worked on less than full load forsufficient lime lo make any necessary repairs to the mains. /\ plain I I I I I H i n I •fT K^ b( L L. FIC. 4. time permit full operation of llie major portion of it. The connect-ing mains are merely conveniences, and whenever desired can beentirely shut off from the operating machines, allowing each sec-tional part of the plant to be operated independently of the remain-der. For instance, if the steam header be shut oflf and out of four or more units would he separately operated and wouldhave different steam pressures. The .steam from one group ofboilers would then be used in its companion engine only. This sys-tem is somewhat expensive, requires more room for lines than a lesscomplete system and necessitates the arrangement of machines instation groups; in fact, the grouping of the related machines for virtually all .systems, rather than the grouping of that has half of its installation idle, say for six hours a day, canbe divided into two sections instead of six. as shown, and the neces-sary repairs to mains be made at times of ligh
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
