Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 43
shore piers, four dredges andeight pneumatic tubes, the work could be driven very fast. Thefirst pier was put down in fifty-five working days, the second, profit-ing by acquired experience, in thirty-one; the third in twenty-five, and the last in twenty-four working days. The two latterbeing the… … Pneinnnlir Pulihjc Finindaliotis. 25 inches below low water, the greatest depth worked at below thestage of the river being 72 feet 9 inches, and tlie greatest pressureof air about 3 atmospheres. When partly down, the pressure of the surrounding soil buckledthe sides of some of the caissons. This…
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