. The street railway review . TURBINE, -MOTOR .\ND BOOSTKR. with the shafts direct coupled; so that when the water is low oneturbine will be used, thus enabling the plant to be worked at its bestefficiency. The turbines will develop 140 h. p. at a speed of 720r. p. m. The electric generating plant consists of a combined bipolardynamo and booster, the generator having an output of 160 amperesat 520 volts and the booster 160 amperes at from 100 to 200 generator and booster are coupled to the turbine by means of afriction clutch, which permits them to be used as an ordinary motor-driven
. The street railway review . TURBINE, -MOTOR .\ND BOOSTKR. with the shafts direct coupled; so that when the water is low oneturbine will be used, thus enabling the plant to be worked at its bestefficiency. The turbines will develop 140 h. p. at a speed of 720r. p. m. The electric generating plant consists of a combined bipolardynamo and booster, the generator having an output of 160 amperesat 520 volts and the booster 160 amperes at from 100 to 200 generator and booster are coupled to the turbine by means of afriction clutch, which permits them to be used as an ordinary motor-driven booster plant when only a small amount of water is avail-able. The mains from the generator and booster and the regulatingwires are carried overhead to the steam power station near by,from which the turbine plant is entirely controlled. Two Lundell. HEAD AND TAIL RACES. of trench 5 ft. wide, followed by 474 ft. of trench 3 ft. 6 in. wide, thedepth in both sections being 4 ft. 6 in. The first portion was madelarger in sectional area, to allow the water to travel slowly and per-mit any sand which might have passed through the first settlingtank to settle to the bottom. At the end of the larger section ofthe race another settling tank has been formed by dropping the bot-tom of the trench 6 in. for a distance of 50 ft., and providing it with ]4-h. p. motors, driven from a small storage battery, are used foropening and closing the turbine regulators. The switch panels forthe generator and booster are on the main switchboard in the steamstation. They comprise one generator panel, together with auto-matic switch, ammeter, voltmeter, positive and negative switches,shunt regulating switch, starting switch, and resistances for regu-lating the generator as a motor when it drives the booster during Aug. 15, 1900.] STREET RAILWAY REVIEW. 443
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