. Electric railway journal . Generator Room, Hales Bar Hydroelectric Station more recent examples is the delivering of power in Balti-more from the Pennsylvania Water & Power Companysplant at McCalls Ferry on the Susquehanna are in operation in this plant now six units of atotal capacity of 44,500 kw, and plans are already being made for extension. The generator voltage is 1 1,000,which is raised to 70,000 for transmission, and at High-landtown, a suburb of Baltimore, it is lowered to I 3,200for local distribution. This plant operates under a headof about 60 ft. and the speed of th
. Electric railway journal . Generator Room, Hales Bar Hydroelectric Station more recent examples is the delivering of power in Balti-more from the Pennsylvania Water & Power Companysplant at McCalls Ferry on the Susquehanna are in operation in this plant now six units of atotal capacity of 44,500 kw, and plans are already being made for extension. The generator voltage is 1 1,000,which is raised to 70,000 for transmission, and at High-landtown, a suburb of Baltimore, it is lowered to I 3,200for local distribution. This plant operates under a headof about 60 ft. and the speed of the vertical turbines is. Power House and Part of Dam, Hales Bar HydroelectricStation 94 A still more recent newcomer in the supply ofhydraulic power to railways is the Mississippi RiverPower Company, which now has its lines operating intoSt. Louis. One of the most recent plants is that of theChattanooga & Tennessee River Power Company atHales Bar. In this, as shown by the accompanyingillustration, the unusual arrangement of three waterwheelson each shaft has been adopted. During periods of lowwater, when the effective head is large but the availableflow is small, the upper wheel on each shaft is shut offand its casing drained, thus permitting it to turn freein air. One factor in the development of water powers is theincreasing use of networks of transmission lines fed atdifferent points from water and steam plants. Mostwater supplies are so variable that if the full low-watercapacity of the stream is utilized the power is at timesquite uncertain. Further, as water-generated power istransmitted over
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