Report on the Effects of the Sea-water and Exposure Upon the Iron-pile Shafts of the Brandywine-shoal Light-house

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Page 3 - General and Chief of Engineers, Hon. WW BELKNAP, Secretary of War. Approved by the Secretary of War.
Page 9 - The whole number of piles in the substructure is 77, and nearly all are covered •л-ith considerable metamorphosed iron, difficult in most cases to scrape off, and many with coral and other adhering substances, which add to the difficulty. The current here is quite strong, and around the piles is broken into numerous eddies. The water is about 9 feet deep at low water. The horizontal braces at about the plane of low water have, in many localities...
Page 9 - ... and to admit of some little convenience in working. # « » *» * ' « * Not having much previous knowledge of the light-house I had somewhat underrated The scope and difficulty of the work involved in a thorough examination of the structure. The whole number of piles in the substructure is 77, and nearly all are covered...
Page 10 - ... time as this was, for various evident reasons. » » » * « * « I judge that a thorough examination of the entire structure would consume two or three weeks of fair weather, and would probably yield results of considerable value and of great interest. All of the piles are more or less perceptibly wanting in vertically, but very few of them seriously so. The two most remarkably inclined abnormally are marked X and У on the diagram accompanying this report.
Page 10 - BO few remain throughout the whole structure in this lower system that it is practically nearly useless, since the remainder are bent downward at various angles, as though by a weight, and they appear ready to follow soon tho fate of the others.
Page 3 - Carroll, Montana Territory, on the Upper Missouri, to the Yellowstone National Park, and return, made in the summer of 1875. It embraces the reports of reconnaissances by Lient. RE Thompson, Sixth Infantry, and scientific reports by Messrs. George Bird Grinnell, Edward S.
Page 9 - Some heavy planks were found at the light-house, which were lowered and put in place as platforms to serve as a base to hold the air-pump, &c., and to admit of some little convenience in working.
Page 11 - X is slightly inclined downward to the southeast. The light-house itself exhibits nothing abnormal; many of the diagonal...
Page 9 - In this way, the lower system of braces is almost completely gone on the. northern side to an east and west line, just south of the north pile of the main structure (of 1848).
Page 9 - The platform of the light-house we found, was more than twenty feet from the surface of the water, and it was at once apparent that we...

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