. Electric railway gazette . Fig. 12. their claims still subordinate all systems where-in sectional service conductors are used. Yet,although such systems were described as early as1881 they were not given serious considerationuntil within a few years. The Ayrton and Perrypatent in England bears date of February, the U. S. patent of will expirein February, , so that these systems can onlybe held in check by this broad patent for abouteight months most recent lype of the sectional service. Fig. 14. conductor and that which will doubtless supersedeall others
. Electric railway gazette . Fig. 12. their claims still subordinate all systems where-in sectional service conductors are used. Yet,although such systems were described as early as1881 they were not given serious considerationuntil within a few years. The Ayrton and Perrypatent in England bears date of February, the U. S. patent of will expirein February, , so that these systems can onlybe held in check by this broad patent for abouteight months most recent lype of the sectional service. Fig. 14. conductor and that which will doubtless supersedeall others at an early day is what is popularlyknown as the middle rail, or third-rail sys-tem. It presents many advantages. There is noslot and no open conduit whatever, so they aresometimes described as closed conduit general plan is about as follows: A feedermain is buried in a closed trough or conduit be-neath the roadway, generally along the middle ofthe track. Above the conduit and exposed in theroadway is the so-called middle rail or servicerails, which are disconnected rails 10 to 20 ft. long.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
