. Revue de chemin de fer électrique . n moteurs à gaz tandem, chacun avec une capacité nominale de 1,500 chevaux. Il est précisé que cet équipementen fonctionnement sera la distinction d'être l'installation la plus importante en Amérique d'unités électriques à moteur à gaz utilisées exclusivement à des fins de traction. La centrale électrique principale est située à Port Washington, des sites de sous-stations ont été fournis. W. A. Comstock, Alpena, au Michigan, est président du comité et F. W. Walker, de Port Washington, est vice-président et ingénieur en chef. 18 mai 1907. CHEMIN DE FER ÉLECTRIQUE RÉVISION 65S TUYAUTERIE ET PUISSANCE

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. Electric railway review . n tandem gas engines, each with a ratedcapacity of 1, 500 horsepower. It is stated that this equipmentwhen in operation will enjoy the distinction of being thelargest installation in America of gas engine driven electricgenerating units used exclusively for traction purposes. The main power house is located at Port Washington, andeight sites for substations have been provided. W. A. Comstock, Alpena, Mich., is president of the com-pany, and F. W. Walker of Port Washington is vice-presidentand chief engineer. May 18, 1907. ELECTRIC RAILWAY REVIEW 65S PIPING AND POWER STATION SYSTEMS—XL. BY W. L. MORRIS. U. E. A svstem for condensing the exhaust steam by means ofatmospheric air is shown in Figure 279 (KM). The exhaustpipe is shown in the center of the air flue, the object beingto increase the temperature of the air to create a draught. Theair would, however, be drawn through the flue by the flowof steam through the ejector flights. The upper section is shown as a water and air Hot flir. Figure 279 (KI-1). separator. In the arrangement of acondenser of this character, it must be noted that theexhaust travels at a highvelocity, possibly 5, 000 feetper minute, and the air at1, 000 per minute, which isquite rapid, about that ob-tainable by a high stack. Towhat extent the air wouldbe accelerated by the ex-haust ejector is quite prob-lematical and to secure thegreatest difference in weightof air in the chimney, andthat without, it may be ad-visable to place the con-denser at the base of thechimney, causing the entirecolumn of air to be at thehighest possible tempera-ture. If the capacity of thechimney is less than the ex-haust blower or ejector, then the increased length ofstack would simply offer re-sistance to the flow of air, as is the case of a highsmokestack placed over thefan of an induced draughtplant. It is quite probablethat the air chimney wouldhave to be fully twentytimes the area of the ex-haust, or about four andone-half times the diamet

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