Issue 11 and Volume 1895 18.

THE MYSTIC RIVER TUNNEL. The tunnel under the Mystic river, Mass., and the Tufts mill pond at the bridge to Everett and Malden, in the Charlestown district, one of the most difficult tasksin connection with the construction of the Boston metropolitan sewerage system, and the pumping on the opposite shore, are now completed. Owing to the nature of the river bed, a system of tunneling known as the compressed air system, introduced for the first time and operated under the personal supervision of the inventor, was employed. This system entirely did away with the necessity and consequent impediment of a temporary wooden structure and bracing to support the excavation until the masonry work was put in place. A railroad track, with cars running thereon, was constructed in the tube as the work progressed, and carried out the mud and brought the supplies of steel, brick, mortar, etc., directly to the…

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