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. 1900 Excerpt: ...of course, provided. It will be noted that while having a minimum thickness of only 8 inches, the average thickness of these side linings is about 20 inches, which with such adhesion of the cement to the rock faces as could be secured by a little care, would, it is believed, give ample stability; but to be on the safe side, the cost of the cap irons and heavy studs shown in the section Fig. 62 are added. The details of all these quantities, unit-prices and hydraulic factors are presented with fulness in Tables 45, 46 and 47, in order that the basis of these estimates can easily be verified by any engineer familiar with this class of work. Large Steel Conduits--Construction, Cost and Water-Carrying Capacity. In nearly all of these aqueduct lines it has appeared expedient to make use of more or less large steel pipe for siphons in crossing valleys. Certain of the possible supplies for Greater New York, for example, that from Esopus Creek, proposed by the Ramapo Company, can be brought in only by means of long lines of steel pipe conduits similar to those through which the East Jersey Water Company brings the Poquannock water to Newark and Jersey City, but, of course, of much larger diameter. To bring the estimates for the several plans to a common basis, the following tables were prepared and used, with such additions as appeared proper for the extra roughness of country, the special structures or the short length of any particular line. The reliability, utility and economy under certain conditions, of properly constructed large, steel pipe conduits are now thoroughly established. The worst thing that can be said against them is their cost, which for the large capacities of 250, 500 and 750 million gallons per day, that we have to consider, is more than doubl...
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