Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 423
re put in as a foundation of the pipe that was to make the leg of the siphon (see Plate C). The shaft on the Boston side was then sunk in the same way, and the tunnel started from that end. In driving the tunnel a shield was used similar to the Great- head design, as shown in Plate D. The… … Plate G. ing the shield forward and closing up the joints in the lagging, although, as the lumber was thoroughly dry when placed, it was found that the swelling of the wood made very tight work. The lagging was given a wash of cement after it was placed, and such leaks as showed were caulked with…
Engineering
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