required, the space between them being filled in with well-rammed puddle, so as to form a solid water-tight mass.(See fig 6.) The great difficulties in the construction of a Fig. 6. … wM^iiilliliiiiiiiiiitiiiiiillllilwiiW^ SUBSTRATUM OF INDURATED MARL +m M- la. cofferdam are—1st, to keep it water-tight ; and, 2nd, tosupport the sides against the pressure of the water outside,which in tidal waters is sometimes so great as to render itnecessary to allow a dam to fill to prevent…
Architecture · Building
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