. Practical physics. wheel per second, in foot pounds orgram centimeters, is the product of theweight of the water wliich passes over itper second by the distance through whichit falls. The efficiency is the work whichthe wheel can accomplish in a seconddivided by this quantity. Such wheelsare very common in mountainous regions,where it is easy to obtain considerable fallbut where the streams carry a small rohuneof water. The efficiency is high, being oftenbetween 80% and 90/;. The loss is due notonly to the friction in the bearings andgears- (see C) but also to the fact that some of the water
. Practical physics. wheel per second, in foot pounds orgram centimeters, is the product of theweight of the water wliich passes over itper second by the distance through whichit falls. The efficiency is the work whichthe wheel can accomplish in a seconddivided by this quantity. Such wheelsare very common in mountainous regions,where it is easy to obtain considerable fallbut where the streams carry a small rohuneof water. The efficiency is high, being oftenbetween 80% and 90/;. The loss is due notonly to the friction in the bearings andgears- (see C) but also to the fact that some of the water is spilled from the buckets or jiasses over without enteringthem at all. This may still be regarded as a frictional loss, since theenergy disappears in internal friction when the water strikes the ground. 179. Efficiency of undershot water wheels. The old-style undersliotwIuhI (Fig. KM) —so common in flat countries, where there is little fallbut an abundance of water—utilizes only the kinetic energy of the water. Overshot waterwheel EFFICIEXCY 149
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
