, will be used in addition to ground;" it is composed of refuse filling matter of all de- could, with good luck, arrive in Boston Friday afternoon, the central tube to facilitate removal of the excavated mate- scriptions, forming a most unstable and diflicult material having stopped all night at… … THE NEW CAISSON-HUDSON EIVEB TUNNEL. chamber, where the men work, is prevented hours, and it is by no means improbable that by introducing compres.sed air into the cham- the time may yet be materially reduced. rial. At the upper end of the central tulie the air lock will ber. It was in this manner…
Patented · Patents · Caoutchouc · Caisson · Scientific American · Conch · Wrought iron · Wood working · Trade catalogs · Oil tanks · Machine shop · Air chamber · Patent issued · Rock drill · Twenty years
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