per sec, would, apparently, be less than 10 ft.
of pipe required, the friction-head, at the estimated velocity of 10 ft. The outboard suction-pipe would be about 90 ft. In practice, a skillful lever-man, working in free gravel, should raise 25 per cent, continuously. If 23 per cent, of this flow was gravel, it would give the required 1,000 cu. the economical velocity of flow in a 24-in. The runner-shaft would have a slip-coupling, so that the runner might be stopped short by an obstruction without anything breaking. pipe would require a pump of cast steel, heavily reinforced and provided with manganese- or chrome-steel liners. Y., which I adopt, with appreciation of his competent advice, a dredge intended to handle continuously gravel that would enter a 24-in. In the opinion of Carl Lager, Superintendent of the Morris Machine Works, Baldwinsville, N. On this basis, the power-requirement would be: The maximum power-requirements of a gold-dredge are estimated from the Steers dredge in operation, and proportioned according to the Oroville practice with dredges having a nominal capacity of 100 cu. On the contrary, there is nothing in the design here proposed which could not be constructed by any establishment experienced in such work. Several manufacturing concerns have been mentioned, as a matter of record, in the foregoing pages but I need hardly say that these references are not intended either to advertise particular parties, or to convey the impression that these parties only would be able to furnish the machinery contemplated. would be exceptionally profitable and I hope that my suggestions will elicit the discussion by engineers in this department of a proposition which, to my mind, promises so great an advance in this relatively new form of mining industry. But I believe that, under suitable conditions, the use of hydraulic suction-dredges of a minimum capacity of 1,000 cu. Many rich stream-beds would not give “ elbow-room ” for such a dredge: many otherwise favorable gold-bearing areas are too small to warrant the cost of its installation and, in some localities, as I have already remarked, the supply of adequate power might be, at the present time, a matter of economically insuperable difficulty. The design and specifications submitted in this paper are not offered as satisfying all conditions of gold dredging.
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