Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 290
systems in deepmines, the simple expedient is used of bailingout the mine with buckets. The mine shaft is really a giant well, and the buckets-or tanks, as they are called -are arranged inpairs, so that as one of them is going down theother is coming up, thus one partly counter-balances the weight… … THE BICKET BEING FILLED WITH WATER water outside, but when they are drawn upthe pressure of the water inside keeps themclosed. When the tanks are brought up tothe top of the mine shaft an automatic tripopens the valves and the water pours out intoa reservoir. 203 204 NATURE AND SCIENCE FOR YOUNG…
Children's literature
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