Water-power; an outline of the development and application of the energy of flowing water . Fig. 225. weight of the wheel and other revolving parts may be thrownupon the same bearing if desired, and this is generally the morejudicious arrangement, as it admits of more efficient lubricationthan the ordinary bearing at the bottom of the shaft. For heads exceeding 200 feet, and even for heads exceed- 5H THE FOWER-HOUSE. ing lOO where the velocity of the generator is hmited, thedisposition of Fig. 226 may be adopted. The general arrange-. FiG. 226. ment of the power-house is the same as the preced
Water-power; an outline of the development and application of the energy of flowing water . Fig. 225. weight of the wheel and other revolving parts may be thrownupon the same bearing if desired, and this is generally the morejudicious arrangement, as it admits of more efficient lubricationthan the ordinary bearing at the bottom of the shaft. For heads exceeding 200 feet, and even for heads exceed- 5H THE FOWER-HOUSE. ing lOO where the velocity of the generator is hmited, thedisposition of Fig. 226 may be adopted. The general arrange-. FiG. 226. ment of the power-house is the same as the preceding, but weadopt a different form of wheel, viz., the hurdy-gurdy wheeldriven by a jet of water acting on cup-shaped vanes (see page332). The peculiar adaptability of this wheel consists in thefact that a low velocity of rotation can be imparted to the shaftunder the highest head by giving the wheel a suitable head, in this case, is assumed to be lOOO feet, imphing av^elocity of 254 feet per second. The tliameter of the wheel is12 feet measured to the centre of the vanes, and, as it gives itsbest effect with a velocity of vane equal to half that of jet, thespeed will be 127 X 60/12 X tt = 200 per minute. A 3-inchstream would carry cubic feet of water per second andwould furnish over lOOO As in the former case, the tail- SUPPLIED BY A PIPE. 515 i i ^
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthydraulicengineering
