. Le journal de chemin de fer de rue . l'arc d'usines étant équipé de moteurs à gaz donne promiseof plus vivivivivifier la concurrence à l'avenir. DOCUMENTS LUS À LA CONVENTION DE PHILADELPHIE DE L'ASSOCIATION AMÉRICAINE DE MÉCANIQUE FERROVIAIRE ANDELECTRICAL LE SYSTÈME DE DISTRIBUTION DE L'ÉNERGIE DE LA COMPAGNIE ferroviaire BOSTONELOVATED PAR C. H. HHE, surintendant des fils, Boston Elevated Railway Company en considérant un système établi de distribution de l'énergie pour la meilleure compréhension de ses avantages et de son efficacité, il est essentiel que l'on ait une connaissance des conditions et de la disposition des centrales électriques par rapport à t

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. The Street railway journal . plants arc being equipped with gas engines gives promiseof livelier competition in the future. PAPERS READ AT THE PHILADELPHIA CONVENTION OFTHE AMERICAN RAILWAY MECHANICAL ANDELECTRICAL ASSOCIATION THE POWER DISTRIBUTING SYSTEM OF THE BOSTONELEVATED RAILWAY COMPANY BY C. H. HILE, Superintendent of Wires, Boston Elevated Railway Company In considering an established power distribution system for thebest understanding of its advantages and efficiency, it is essentialthat one has a knowledge of the conditions and disposition of thepower plants in their relation to the territory served. Among engineers entrusted with the laying out and designing ofpower plants and transmission systems there are two recognizedtendencies in their treatment of such questions. The most promi-nent, perhaps, because the most radical of these two tendencies of BOSTON ELEVATED RY. CO. Plan showing- relative location of five principal stationswith distribution of load within i mile and 2mile radii. WINTER 1903-04. FIG. 1.—DISTRIBUTION DIAGRAM late years, is for large central power stations, correspondingly largepower units, and the alternating-current transmission system withsub-station conversions. The development in the science of engineand dynamo construction, in connection with the progress made inhigh-voltage transmission systems, has made such engineering ven-tures easily possible as well as practicable. The other tendency, while not necessarily opposite in method and effect, is more the result of a growth and development, based upon conditions as theyhave presented themselves to the engineer, covering years of pro-gress and expansion of a single or a number of power systems. At present writing it cannot be said that the merits and advan-tages of either practice over the other have been conclusively proven.Each power and transmission problem has its individual conditions, and these in connection with the requirements of good engineeringmust determine the type

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