Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 224
es it to sink. In the middle of theroof of the caisson is a well that reaches down to apool of water inside. On top is a derrick for hoist-ing the dirt and stones out of the well, and a littlerailroad for carrying the rubbish to the barge thatfloats in the river. On top of the caisson can also… … there is no water inside the tumbler, and that thebottom of the bowl is nearly dry. The air caughtunder the tumbler has pushed the water away. If thetumbler were large enough, a man could stand insideand dig out the bottom of the bowl quite comfortably.Now imagine a huge wooden box, 168 feet…
Children's literature
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