In intermediate positions the guide vane deflects {HEAD ~ the in flowing stream} of water toward {TAIL ~ the frusto conical wall} so that the water, when the pressure head exceeds a certain valve, is caused to rotate about the axis of the housing to produce the desired brake effect 
toward
In intermediate positions the guide vane deflects { HEAD ~ the in flowing stream } of water toward { TAIL ~ the frusto conical wall } so that the water , when the pressure head exceeds a certain valve , is caused to rotate about the axis of the housing to produce the desired brake effect
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