. The Street railway journal . MODIFIED FORM OF CONTACT DEVICE USED IN TESTSAT GROSSLICHTERFELDE 40 tons each. Both are of the double-truck type, with one motorof 150 hp on each of the four driving axles. The motors aremounted direct on hollow shafts on the axles, driving the latterby means of a flexible coupling. For the passenger cars the so-called cascade connection is made use of, two of the motorsbeing connected to the 3000 volts directly, the other two to the 300volts induced in the rotors of the first two. Thus half-normal speed is obtained and a certain economy in starting. The freight
. The Street railway journal . MODIFIED FORM OF CONTACT DEVICE USED IN TESTSAT GROSSLICHTERFELDE 40 tons each. Both are of the double-truck type, with one motorof 150 hp on each of the four driving axles. The motors aremounted direct on hollow shafts on the axles, driving the latterby means of a flexible coupling. For the passenger cars the so-called cascade connection is made use of, two of the motorsbeing connected to the 3000 volts directly, the other two to the 300volts induced in the rotors of the first two. Thus half-normal speed is obtained and a certain economy in starting. The freightlocomotives, however, use resistances only for starting contact device is of the roller type, two copper rollers 40 cmlong being separated by a piece of hard wood 12 cm long,saturated with parafin under at Grosslichterfelde.—.Still higher voltages were used by. CONTACT DEVICE USED IN ORIGINAL TESTS ATGROSSLICHTERFELDE Siemens & Halske in 1899 and 1900 during extensive tests madeon the Teltower road, between Grosslichterfelde and Zehlendorf,on a specially constructed test track a little over one mile long,normal gage, with curves of 200 m, 100 m and 40 m radius. Onaccount of the traffic on this public road the contact line had tobe placed on one side of the road, and for the same reasons aguard-wire net had to be fixed under all wires. The main objectof these tests was to find a suitable contact device and the bestpossible line construction to handle a current of 10,000 volts, andat car speeds up to 60 km (37 miles) per hour. The first tests were made with a device making contact with theline from above. The line wire was fastened to triple petticoatporcelain insulators by means of special brass pieces. The in-sulators were mounted on wooden cross-arms of different lengths,which were hinged to iron poles in such a way as to permit thetens
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
