el of the fact that it was a merely tem- penstocks 10% feet in diameter, which porary construction, varied from 20 to conduct the water to the bottom of the 46 feet in width, and had a total depth This excavation is 421 feet long, 37 feet wide, and 138 feet deep. wheel pit. of water against it,… … vertical hollow shaft 115 feet in length, full of boulders and deep fissures. The This shows the condition of the river bottom on the site of the outer basin. which extends up through the wheel pit, dam was built out in 16-foot sections. and is supported at three intermediate Each section was…
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