ented by being directed from its course by the short handles N, are for winding up the chains on tive view of the dam and all its parts, and fig. the dotted lines, e'te. These also are raised 3 is a small vertical section of the windlass the drum, M, of the windlass, on which is a canal. pawl and a… … back of the dam. In figure 2, 6 G are stakes two distinct parts, 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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