The Bridgeport evening farmer., 1909-08-25
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LMA0DN lE G4A. other, and from point of cost either one was equally efficient The A. C.. method however had the additional disadvantage of more frequent out ages, due to line troubles, than the Since 1906 the electrical manufac- turers have been endeavoring to inn prove the methods for producing arc lamps. The, first of any moment was the so-called '-Tetanfum Lamp" but as this proved a practical failure it has been abandoned.
 The second attempt was the "Lum- consists of alternating current genera tors. either engine driven or turbine driven, with tub transformers and mer- curry arc rectifiers This system uses an enclosed lamp
 Experimental sets of 50 lamps of this new method were installed by the manufacturers in 190S but developed, like all new inventions. many trou- bles. sfa Impressed with the probable outcome of this method, the United Iiiuminat- ing Company installed a trial set in December, 1908. So many difficulties in the practical working of the devices occurred, that for a time it looked hopeless The makers kept their ex- perts at work upon it daily for three months, and after developing some new and additional devices and safe guards, succeeded in getting it in good working condition i'm May, 1909, and then the Illuminating Company decided to adopt the system, and orders were given for the requisite steam turbine driven units and lamps and other nec- essary equipment for the replacing of all Of it's street lamps with the most modern known system of lighting. This system has now been adopted by Boston, worcester, Taunton Fall
 River and Hartford and many others
 The Illuminating Company are pro- ceeding as rapidly as possible with the changes, but are dependent upon the
 manufacturers of the appliances for
 delivery and installation.
 1t will probably be in working con dition in Bridgeport in the early fall.
 but will require some weeks in which to make the necessary changes in the street system. and educate employees to economical methods of handling the work. The first cost of the installa- ton is excessively large, some $50, 000. and as for some time after installation two sets of hands must be employed, until the changes are complete, no economy in operation can be looked for.
 Theoretically with this new system the cost of producing arc lamps should be reduced. Practically. the method is so new, lapps have been used for so short period. that no actual ex- periences, extending over a reasonable t1kliS, fdIS dSdIldO1S, lO Q6tefI1lne lI6 ultimate economy of the system
 The lamp requires the same amount of energy sent out on the line. as that required by the open arc lamp, hence no economy can be looked for in this direction. as to the cost per lamp for current used.
 The new lamp. being of the enclosed type, does not need trimming as ire how long this new lamp will burn without such an accumulation of dirt in the globe as to require cleaning, is to be demonstrated. < The new lamp uses a. special form of electrodes, costing ten times as much per electrode as those used in the open arc lamps. The electrode, however. burns nearly ten times as many hours.
 The new system also requires the use of Mercury Arc Rectiffers.'' This rectifier costs today $25.0O each. Its life is problenatica1. At present it's obstacle in the way of economical ope- ration of the system. It is believed, however. that the cost will ultimately be reduced, and it's useful life length ener, thus effecting an economy.
 The apparent advantages of the new system over the old are:
 First. The method of the construc- ton of the lamp is such as to elimfn- directly below the open arc lamp The distribution of the light given Is more uniform.
 Second. The construction of the lamp is such that they are not affect ed by sleet and ice storms, or high winds, to the same extent as the open arc lamp.
 Third. The lamps are much more efficient. Vhe manufacturers of Mag netite lambs claim that they give 30 per cent. more light for the same energy expended than the open arcs do. NSs4
 Fourth. It would appear. from a careful examination of the system, that ultimately after all troubles are eliminated, and the manufacture of Rectifiers and Electrodes becomes more general, thus costing less, that the method shorrlG result in a marked economy in the cost of street light ing.
 After a most careful and full analy- sis of the economy and advantages claimed for the new method, with strong faith in it's ultimate outcome as the modern method of street light ing, the company have contracted for the requisite plant for street lighting in New Haven and Bridgeport.
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