Statistics of power and machinery employed in manufactures Volume 2; reports on the water-power of the United States

 
9781231062739: Statistics of power and machinery employed in manufactures Volume 2; reports on the water-power of the United States

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. 1887 Excerpt: ...branches on, was first placed on the bed of the stream. The trees were laid side by side, parallel to the course of the stream, and were packed as closely together as possible, their buts pointing down stream. Upon this layer, which was perhaps 4 feet deep, a 4-foot layer of brush was added. An oak log was then placed on the brush, running transversely and several feet back from the ends of the trees, thus leaving their buts projecting a little way for an apron. Long spars, running up stream, were now dovetailed to the transverse log, and upon top of all loose rock was piled as thickly as possible. There were then added successively a 4-foot layer of brush, a transverse log, and spars, as before. The top was next filled with rock to a regular incline, and planked over for a distance of 30 feet back from the crest. The owner puts the cost of the structure at only $700. It was built in 1875, and is 160 feet long, with a fall of 8 feet; it stands well, and is reasonably tight. Before this dam was built a log dam was in use, but did not stand successfully. The pond extends 3 miles up stream. There is a head of 8 feet on the wheel, which gives power for three runs of stone. Water is brought to the wheel through a tunnel excavated in the rock, 80 feet long and 6 by 4 feet in cross-section. A separate tunnel, 1,000 feet long, conveys water to run two elevators (about 12,000 and 20,000 bushels capacity), and a pump for the railroad water-tank. There is always a surplus of water at this privilege, and for one to four weeks trouble is experienced from backwater. The owner estimates that with the present dam six runs of stone could be carried in the lowest stage of river. The river in this part of its course is about 150 feet wide, with a depth varying from 4 feet at ...

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