ed by handles N, are for winding up the chains on being directed from its course by the short tive view of the dam and all ita parts, and fig. 3 is a small vertical section of the windlass the drum, M, of the windlass, on which is a the dotted lines, e’e ¢. These ‘also are raised canal. This dam,… … back of the dam. In figure 2, G G are stakes two distinct parte, and it ean be set across the portable coffer dam. Nothing more is required Every improvement in portable dams is of driven into the banks of the stream; D’ D’ D’, whole breadth of a stream, or only half across. to be said in…
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