Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 455
to a cherry-red. Dikes or dams over which there is no flow of water can be made entirely ofearth. It is sufficient that the material be made more compact than the natu-ral earth in which the dam is built, that it be of sufficient section to resist thepressure, and width to obstruct the flow of… … DRAWING. Dikes across salt marshes aremade of material taken from themarsh at some distance from thesite of the dike, well packed in thinlayers on a base prepared on thesoil without excavation. Sand andgravel, being heavier than the moistmaterial, break through it and set-tle to the bottom,…
Mechanical drawing
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