the construction of the Broadway tunnel the quite thin, and is called the hood. Arranged around point is very great, and the current very swift, viz., Beach hydraulic shield has been employed on a num- the main walls of the cylinder and longitudinal there- eight miles an hour. So the construction… … Fig.3.— inches, with flanges Jersey City, N. J. Fig. 6.—Segment of inside 6 inches deep The shields here and 13¢ inches in used have an exter- thickness. These nal diameter of 19 ft. STATES AND CANADA. seginents are cast 11 in. with 82 holes in ; As before stated, a common pump, each jack having…
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