In my opinion, all three causes of trouble may be remedied: the first, by making stronger the parts most liable to wear and breakage the second, by means for loosening the gravel at the intake and the third, by sufficiently increasing the diameter of the suction-pipe. The suction hydraulic gold dredges have failed from three special causes: excessive wear and frequent breakage of pump-shell, runners and liners inability to dredge compact gravel which would not readily move towards the intake and, most important of all, closing of the suction-pipe by stones too large to enter it. Repeated failures in attempts to work gold-bearing gravels by means of suction dredges have created the impression that this method is impracticable.
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