Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 779
ncrete pieris built up on its deck, and its weight helps toforce the cutting edges into the ground. As thework progresses, new caisson sections are addedon top, and the shafting is extended for the sand-hogs and excavating material. But where does the water come from? Iasked. The lower end of New… … Photograph by Brown Brothers. AT WORK ON THE FOUNDATIONS OF A SKY-THE FOREGROUND IS A NARROW WOODE SCRAPER. INN CAISSON. air-pressure to keep it out. The first thing we I9I3-J WITH MEN WHO DO THINGS 535
Children's literature
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