. Canadian engineer. Section E=E. ^^^tf^eir/^ ^ A ^r^^jf-^. £?ir}*-^^r . Section L=L. lib THE CANADIAN ENGINEER Volume 30. Construction.—The ground on wliicli the tanks werebuilt was coniposed of sand on the surface, which, in smallareas, formed pockets. The sub-soil was hard, blue were excavated by hand for the west wall andthe western third of the north wall. This part was builtfirst because the ground was low at this side. When thesewalls were built, and the concrete sulliciently hardened,thev were used as a rclaininu; wall tdr llic next material

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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidcanadianengineer30toro