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Macintosh Picture Format  |  1996-02-20  |  269KB  |  640x480  |  8-bit (256 colors)
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OCR: - CIVIL ENGINEERING Asan engineer, Leonardo devised plans to drain the DREDGER which Pontine would Marshes divert and the to Arno build River canals from including Florence one to the sea and enable travel and irrigation eonardo designed this dredger to clean and maintain canals The dred lger is held stationary while four scoops rotate. The scoops have holes in them to let the water drain out The remaining the barges sludge lowered, axle is on is the the deposited left dred adjustable lging The into When height the scoops the of reach axle 18 deeper ENGINEERING into the riverbed. When one area is cleaned the dredger can be pulled forward tc clean CIVIL the next section book of how to deal with rivers so that tthey may keep their bottom scoured by their own flow near the cities they pass. 1 ...