Minutes of proceedings of the Institution of Civil Engineers Volume 57
Цена 25.79 - 50.74 USD
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879 Excerpt: ...passage to the wells. As may bo readily supposed, wells thus filled are soon emptied; and in fact the supply is generally exhausted when a well has been drawn upon for a few hours; and from twelve to sixteen hours elapse before the supply is renewed. The mode of raising the water is by a lever, 20 to 30 feet in length, turning on an axle resting on two uprights, and having a bucket suspended by a rope or light pole from one end, which is lowered and raised by hand, the lever being weighted at the other end so as to counterbalance the filled bucket and facilitate the raising of it. When the well is deep and the lever long in proportion, the work is further aided by a man, and in some cases two men, walking backward and forwards on the lever, so as to contribute by their weight at...