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. 1890 Excerpt: ... the Campo Secco, near the sources of the Aniene, which rises to an elevation of 4,200 feet above the sea. The three serene are said to be capable of yielding 64,000,000 gallons per day. They are each collected in a separate well, from whence they are led in a covered channel to the main aqueduct, into which they can either be introduced or allowed to flow to waste. The total difference in elevation between the source and the service reservoir is 430 feet; of this 366 feet are exhausted in various falls and the remaining 64 feet in the gradients, which are rbW drb" and 4700"the averaSe being fnr The dimensions of the section of the aqueduct are: a constant depth of 2 feet ll? inches, with widths of 2 feet 8 inches, 3 feet 4? inches, and 4 feet 0 inch, according to the gradient;...