Issue 26 and Volume 22.

SEWER UNDER THE SUDBURY TUNNEL. A difficult, costly, and dangerous piece of engineering was recently successfully concluded at Newton Highlands, Mass., where a tunnel was built under the Sudbury aqueduct to contain a sewer. The method pursued was novel. On each side of the aqueduct excavations were made to the desired depth, after which steel cylinders, six feet, six inches long were forced by a jackscrew through the soil, and the material dug out from in front of them. These cylinders were telescopic in form—the largest being ten feet, five inches in diameter, and the smallest live feet inside measurement. The material of which they were composed was boiler steel three-eighthinch thick, in one sheet lapped and fastened with one row of rivets. When placed in position in the tunnel, each cylinder lapped six inches over the adjoining one. Between the plank bulkheads at each end the whule length of…

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