Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 139
d the point of delivery. So long as they do not rise above thelevel of the source of supply, so long will the water continue to flow. Fig. 119 represents the line of a modern aqueduct:—a a a represents thewater level of a pond or reservoir upon elevated ground. From this pond aline of pipe is laid,… … The ancients, in constructing aqueducts, do not seem to have ever practi-cally applied this principle, that water in pipes rises to the level of its source.When, in conducting water from a distant source to supply a city, it becamenecessary to cross a ravine or valley, immense bridges, or arches of…
Physics · Science · Technology
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