. The Street railway journal . een poles is between 35 m and 40 m. Tbespan and anchor wires are made of 5 mm steel, having atensile strength of about 70 kg per square meter, while thecopper trolley wire has a strength of 40 km. The insul-ators are designed especially for this service to stand heavypull and pressure, and not absorb moisture. Soldering ofthe trolley wires is avoided, as special sleeves are used forconnectors. The details of the overhead construction arevery clearly shown in the accompanying cuts. The cars are equipped with signal bells and the collect-ors are lighted by colored
. The Street railway journal . een poles is between 35 m and 40 m. Tbespan and anchor wires are made of 5 mm steel, having atensile strength of about 70 kg per square meter, while thecopper trolley wire has a strength of 40 km. The insul-ators are designed especially for this service to stand heavypull and pressure, and not absorb moisture. Soldering ofthe trolley wires is avoided, as special sleeves are used forconnectors. The details of the overhead construction arevery clearly shown in the accompanying cuts. The cars are equipped with signal bells and the collect-ors are lighted by colored lamps, so that the direction inwhich the car is moving can be readily distinguished. Mr. Marcher has made a series of tests of the amount ofpower required for operating cars upon trackless trolleylines, with the view of comparing the actual cost with thatof systems employing rails, and he is convinced that auto-trolley cars must be built as lightly as possible in order tomake a satisfactory showing by comparison. If the weight. The rate of fare charged, the possible earning capacity ofthe equipment under these conditions, and other items thatwould have a bearing on the problem are not given, butit is to be presumed that this is a fair showing, at least, forthe plant. Another installation, described by Mr. Marcher in hispaper, offers some data of interest. This road is 5 km inlength, and there are twelve cars operated under ten-minute headway on week days and five-minute headwayon Sundays. The cost of construction and equipment isgiven as follows: Five km of overhead construction $15,000 Twelve cars 22,500 One car house and small office equipment 6,500 Transport, packing, interest, superintendence and in-cidentals 2,500 Totals 46,500 OVERHEAD CONSTRUCTION, SUPPORTED BYSPAN WIRES of a bus is as great as that of an ordinarytrolley car, say 9 tons, three times as muchpower would be required to operate it, andfor a wagon weighing as much as a car for
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
