. The Street Railway journal . cette fois, 224turbines d'une capacité globale de plus de- 350,000 ch, dont le nombre d'avériés avait été installé au cours des deux dernières années. La machine à écrire est informée que les commandes de turbines prises par les fabricants de largestwo dans ce pays s'additionnent (1er juillet 1905) à plus de 800 000 ch. Les progrès remarquables réalisés dans la fabrication des thélemachines, et leur adoption générale par beaucoup des chemins de fer les plus proges du pays, les prouvent comme les plus formadablecompetiteurs du moteur alternatif, si, en effet, il n'indic-cate pas qu'ils ont déjà es

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. The Street railway journal . that time 224turbines of an aggregate capacity of over- 350, 000 hp, the greaternumber of which had been installed in the last two years. Thewriter is informed that the orders for turbines taken by the largesttwo manufacturers in this country aggregate (July 1, 1905, ) over800, 000 hp. The remarkable progress made in the manufacture of thesemachines, and their general adoption by many of the most progres-sive railways in the country, proves them to be a most formidablecompetitor of the reciprocating engine, if, indeed, it does not indi-cate that they have already established their commercial superiority. It is to be regretted that most of the data upon the efficiency ofsteam turbines has been derived from tests covering very shortperiods of time, usually only a few hours, and that so little datais available of their performance under actual service conditions.To the street railway manager or engineer, power station recordsfor long periods, showing the coal consumed per kilowatt-hour, or, . September 30, 1905.] STREET RAILWAY JOURNAL. 58/ better still, the efficiency of the plant expressed in percentage ofheat energy in the coal converted into electrical energy at theswitchboard, are of much greater interest and value than the recordof any number of short-time tests for steam consumption only, asit provides him with a much more practical means of making com-parisons with the performance of other stations with which he isfamiliar. The data which has been published illustrating the rela-tive economy in steam consumption of turbines and reciprocatingengines rarely ever shows comparisons between units operatingunder identical conditions as to steam pressure, superheat, orvacuum and therefore does not fairly represent the relative per-formance of the two types, and, too, the steam consumption of theauxiliaries is also invariably omitted, so that it is impossible toform an intelligent opinion as to the additional cost of the highervacuum required

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