Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 395
ey did was to punch holesthrough the crust with a steel punch, and thendrive the piles through the holes into the softrock with a steam-hammer. 242 WITH MEN WHO DO THINGS [Jan.,. You mean a pile-driver? suggested Will. No; a steam-hammer which gives quick, sharpblows. If they had used a… … A CONCRETE CEXTIIEI pier and sunk a coffer-dam over the spot. Thecoffer-dam in this case was a big box withouttop or bottom. When this had been sunk, thepiles were driven. Then a layer of concrete waslaid on the rock to seal the bottom of the coffer-dam so that they could pump out the water. Do you…
Children's literature
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