. Electric railway journal . stantfrom the power sta-tion. This is known asthe type R. 0. trans-former and does notrequire a substa-tion or an transformerspossess current reg-ulation as close, andthrough as wide arange as is given bythe best station typeof constant-currenttransformer. Thecurrent from fullload to no load ismaintained within 1per cent of feature ma-terially prolongs thelife of Mazda lamps operating on the circuit which itcontrols. The efficiency is the same as for the stationtype transformer and the high power factor is high. As shown by the illustratio
. Electric railway journal . stantfrom the power sta-tion. This is known asthe type R. 0. trans-former and does notrequire a substa-tion or an transformerspossess current reg-ulation as close, andthrough as wide arange as is given bythe best station typeof constant-currenttransformer. Thecurrent from fullload to no load ismaintained within 1per cent of feature ma-terially prolongs thelife of Mazda lamps operating on the circuit which itcontrols. The efficiency is the same as for the stationtype transformer and the high power factor is high. As shown by the illustration each transformer ismounted in a cylindrical steel tank with leads broughtout through bushing holders similar to those of a stand-ard potential transformer. This tank is filled with thesame high grade insulating oil used in GE standard type-EE transformers. All precautions have been taken tomake the type R. 0. transformers weather-proof andthey should require no more attention than a constantpotential pole-type CONSTANT-CURRENT TRANSFORMERSUITABLE FOR POLE MOUNTING Varied Functions of a RailwayChemical Laboratory Extensive use of a well-equipped chemical laboratoryis proving indispensable as a source of economy to theUnited Railways of St. Louis, Mo. This company, be-sides making tests to determine the grades of variouspurchased materials, also has facilities for manufactur-ing many products. Tests are made to determine the heat value, amountof ash, moisture, etc., in samples of all the coal used,which sometimes exceeds 300 cars per month. About20,000 gal. of lubricating oil are used monthly and 4000gal. of gasoline. The color and viscosity of the oil arenoted and its flash and fire points are determined. Thevaporization points of samples of all the gasoline arefound by a system of distillation which is replacing thegravity determination. The laboratory is equipped tomake tests on steel rails and ties, and has a machinefor testing cement. The company manufactures
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