Items related to A manual of civil engineering practice; specially arranged...
A manual of civil engineering practice; specially arranged for the use of municipal and county enginners - Softcover
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 Excerpt: ... energies to perfecting turbines. It is surprising how little consideration some engineers give to the subject at all. We may admit that the output required may be greatly in excess of what could be supplied by water, but why not utilise what there is, and help the engines by daily and hourly reducing the coal bill? Turbines find use in a variety of places, electric generation for large supplies and for country-houses being perhaps of primary importance. There is no doubt, however, pumping machinery could well utilise it. A small stream would work a stonebreaker, and the surveyor could have all his stones broken for nothing, saving about 1/4 to 1/6 per ton of road metal. We are not concerned with old-fashioned water-wheels. They gave, no doubt, to their designers much satisfaction; their efficiency, however, was always low, rarely obtaining more than 50 per cent. Besides, they are too cumbersome, slow, and heavy, and are now universally giving way to suitably designed turbines, which will work on almost any fall available; and when the fall is very high, we resort to a very efficient motor, the pel ton wheel. Turbines also have the advantage of very little wear and tear, and the necessity of hardly any attention. The turbine is also remarkably steady in running, especially those of the pressure type; water-wheels are just the opposite. When there is a running stream there will always be a certain amount of power available. Say, for instance, the engineer gauges a stream in the manner described under Hydraulics, and finds the average flow is 1000 cub. ft. per minute. Between two convenient points on the stream, 1200 ft. apart, by levelling, he ascertains that there is a difference of surface-level of 10 ft. Then if he places a weir at the upstream point and ...
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