The book Annual Report .. 1931 was written by author Boston (Mass.). Transit Dept Here you can read free online of Annual Report .. 1931 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Annual Report .. 1931 a good or bad book?
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This shaft, as well as the two ventilation shafts, is built of reinforced concrete. Its outside dimensions are 34 x 43 feet and the bottom of the concrete invert is 43 feet below the street surface. On the southwesterly side, or the side facing Boston, a circular opening 33 feet in diameter was left, and a temporary bulkhead was constructed of tongued and grooved sheeting supported by horizontal steel beams. On the northeast side, a rectangular opening was left for connection to the open cut or... rectangular portion of the tunnel. This opening was bulk- headed in a manner similar to the circular opening. The excavation for this shaft was carried down for the most part by the use of a grab bucket operated by a gasoline- driven crane of the crawler type. The banks were held by use of horizontal tongued and grooved sheeting supported on the flanges by steel H columns, driven vertically into the ground and spaced about 10 feet apart. These columns were braced where required by a system of wooden trusses.
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