. Scientific American 74 Volume Numéro 14 (avril 1896). les périphéries de la turbines haute et basse,coupant la sortie pour l'eau comme il se lève, et givinga plus grande ouverture qu'il descend. Dans la section viewthe portes vitesse de fermeture sont affichés près des deux tiers de l'orifice, et sur le pont au-dessus est vu l'bearingfor le levier de vitesse gate, qui est illustré à travers le extendinghorizontally coupe juste au-dessus du niveau du sol.Le gouverneur est garanti pour maintenir la vitesse withintwo pour cent du taux de droit commun souhaité con-ditions. Le travail sera-il brusquement augmenté ou diminishedto une exten

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. Scientific American Volume 74 Number 14 (April 1896). the peripheries of the upper and lower turbines, cutting off the outlet for water as it rises, and givinga larger opening as it descends. In the sectional viewthe speed gates are shown closing about two-thirds ofthe orifice, and on the deck above is seen the bearingfor the speed gate lever, which is shown extendinghorizontally across the cut just above the floor level.The governor is guaranteed to keep the speed withintwo per cent of the rate desired under ordinary con-ditions. Should the work be suddenly increased or diminishedto an extent of twenty five percent, the governor willhold the speed variation down to four per cent. A vertical thrust bearing, similar, except that it isvertical, to that on the shaft of a screw propelled ship, is provided near the upper end of the shaft. This isnecessary, because the varying inflow of water causesthe pressure exerted by the shaft to vary. This pressuremay even sometimes be negative or upward. The wheels discharge at full load 430 cubic feet of. SECTIONAL VIEWS OF ONE OF THE NIAOABA TUBBINES. water per second and utilize 136 feet of head, thewheels rotating 350 times per minute. At seventy-fiveper cent efficiency they give 5, 000 horse power. The original idea was to have a ten ton flywheel141^ feet in diameter on the shaft. The rotating fieldof the dynamo takes the place of this. Our large cut shows the great wheel at work. Thewater is seen escaping from the curved buckets. Barsof iron are seen running up and down the outside ofthe barrel, which bars operate the annular speed gates, the lower one of which appears below the outflowingwater. The speed gate lever and sheet steel tubulardriving shaft are seen above the wheel, and the pen-stock rises on the left hand. The outflow passesthrough a curved sluiceway into the tunnel. By rockshafts and levers the bars for working the speed gatesare increased in number. From the governor, directlyover the top of the shaft, a single b

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• bookcentury1800
• bookdecade1890
• booksubjectcivilse
• bookyear1896