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Progress of Electricity.

The dampness possible to eleotro-motors, when used for such purposes as tramcar propulsion, has been one of the possible oauses of failuro, since dampness tends to the breaking down of the insulation (and thereforo the destruction) of any dynauioeleotrio machine or electro-motor. It is therefore interesting to note that the experiment of washing an electro-motor with a fire hose was recently made at tho works of the Thomson-Houston Electric Company, Lynn (Massachusetts), when one of the company's ordinary motors was fitted with a nawlydesigned armature, and while running at a difference of potential of 500 volts (300 to 500 is the range used for tramcar propulsion) at the brushes, it was well doused with water. In spite of this the motor ran as quietly as under the ordinary circumstances of its use, and passed through the ordeal without being in the least damaged. The success of this experiment having been so complete, it is now intended to make it a standard tost at the Thomson-Houston factory. One of the latest applications of the electromotor, whioh has excited much interest, not only from its novelty, but also from the excellence of its operation, is that of turning drawbridges. One installation of this de scription, full details and illustrations of which are given in the ' New York Electrical Review' of April 20 last, has recently been carried out at Bridgeport, Conn., by the New England Electric Supply Company. Hitherto the bridge bad been worked by hand by three men, but this was a most expensive prooeediug, and the 7i-h.p. Thomson-Houston motor, which has recently been fitted up, dees tho work not only cheaper, but also in about one-third of the time. The installation is complete in every detail; its operation is excellent, and reflects much credit upon the ThomsonHouston apparaiu i. As the time previously oocupied in moving the bridge had considerably impeded the traffic, the innovation is hailed with the greatest possible satisfaction by all classes of the community. The arc lamps now being largely used for the lighting of the boulevards and streets in Paris are mostly made by the ThomsonHouston Electrlo Company, of Boston, U.S.A. The Parisian representatives of that company have also large contracts in hand for incandescent lighting, and these will be carried out on the Thomson-Houston alternating system. (N.B. —We understand that the art gallery of our Exhibition will be lighted by this system.) We (' Electrical Review') hear that the United Electrical Engineering Company have closed a contract with the Mines and General Telpher Company, Limited, for the construction of a Telpher line to convey risitora from the Wood Green station up the hill to the Alexandra Palace, For new and sparsely populated countries Telpher lines have been long admitted as the best means of opening up such countries, since they act as feeders to railways where the capital outlay for tho latter is unwarranted for the demands of the district. Now that pasdengers can be so carried there is an additional argument for the nse of such lines, which cost very little more (and, if many streams to be crossed, lees) than roads, while they arc much cheaper than railways to construot, for they need no bridges, culverts, cuttings, or embankments, and can negotiate grades up to lin 3. The economy of working expenses is also a great feature, since no driver, stoker, or attendant are necessary, white in many places water-power for generating the electricity is available. The depreciation of the line (or permanent way) shonld be much less than a railway, since floods are not likely to affect it.

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Bibliographic details

Progress of Electricity., Evening Star, Issue 7966, 23 July 1889

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Progress of Electricity. Evening Star, Issue 7966, 23 July 1889