1896. 



on the Utilisation oj Niagara. 



273 



solid, flaring out again each side of the journal bearings. The speed 

 gates of the turbine wheels are plain circular rims, which throttle the 

 discharge on the outside of the wheels, and which, with the co-opera- 

 tion of the governors, keep the speed constant within 2 per cent, under 

 ordinary conditions of running. These wheels are of the Swiss design 

 of Faesch and Picard, and have been built by I. P. Morris & Co. of 

 Philadelphia, for this work. 



The dynamos thus directly connected to the turbines are of the 

 Tesla two-phase type (Fig. 4). Each of these dynamos produces two 



Fig. 4. — Niagara 5000 Horse-Power Two-Phase Alternator. 



alternating currents, differing 90 degrees in phase from each other, 

 each current being of 775 amperes and 2250 volts, the two added to- 

 gether making in round figures very nearly 5000 horse-power. This 

 amount of energy in electrical current is delivered to the circuits for 

 use when the dynamo is run by the turbine at the moderate speed of 

 250 revolutions per minute, or say 4 revolutions per second. Here 

 then we have, broadly, a Tesla two-phase system embodying the novel 

 suggestions and useful ideas of many able men, among whom should 

 be specially mentioned Mr. L. B. Stillwell, the engineer of the 

 Vol. XV. (No. 90.) t 



