Items related to Leffel's construction of mill dams; and Bookwalter's...
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. 1881 Excerpt: ...the crib. In the engraving, planking is shown put on vertically, extending up to a level with the crest of the dam; and if the whole face of the abutment is covered in like manner, it will be all the more secure. Hewed logs are preferred to other lumber for erecting this abutment, as being more durable and equally satisfactory in other respects. 1 he chief peculiarity of this dam, and one which seems to recommend it for any suitable locality, is the manner in which the sheet piling at the base of the abutments is secured, being fastened to sills at both the top and bottom of the piles, instead of driven down into the river bed in the ordinary manner. Mr. John H. Macdonald, of Pyburn's Bluff, Tennessee, who erected this dam in 1867, describes his previous experience in the use of piling as follows: "In 1866 I built this mill, and drove the spiling to a depth of 5 feet. I thought I had one of the best jobs in the world, and it was nice at the top. In June, 1867, my dam undermined, and everybody cried out 'Rat!' On examining it carefully, I found that it was the fault of the spiling, and when I ditched it out I found it in this shape: Stick your three fingers out straightthen draw your second finger forward--you can then see how my spiling was at the lower end. Now I suppose this is the case with all drove spiling; and no wonder the rats get so much abuse. Suppose a rat cuts a hole in the drove spiling, and the water commences running through; there is nothing at the lower end to hold, and the spiling begins to give way, one by one, till all is gone or ruined. The advantage my plan has over spiling is this: suppose a rat does cut a hole through the spiling, all the water can do is to pour through the hole. It cannot affect the dam, for the spiling is fast...
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- PublisherRarebooksclub.com
- Publication date2012
- ISBN 10 1130209385
- ISBN 13 9781130209389
- BindingPaperback
- Number of pages86
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