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to throw the ore from one trommel to the other. On outside of trommel, and over star-shaped supports, place circle of grooved sheet iron for driving-cord. " Driving Gear. —Two uprights of 3in. square timber carry a revolving shaft of lin. square bariron, turned round at ends, and journalled by ordinary bearings. On this are placed wooden grooved wheels, one above each of paddle pulleys, and one above grooved driving-bands of trommels, both of which are driven by the one cord passing round and under both. Three grooves are provided in this driving-wheel, so as to admit of varying relative speeds of paddles and trommels. At end of shaft are driving and loose pulley driven by motive-power. The cord driving trommels should be provided with any suitable form of tension gear as most convenient on premises. Other cords do not require this, as the strain is small. " Notes. —For full and continuous working, it is advisable to attach a square recess to tank at each end, one for withdrawing one truck, and the other for other. Also four bodies of trucks should be provided adjustable to frame and wheels at bottom, so that wheels never leave rails, and bodies of trucks are removed in about a minute. By this arrangement there is no appreciable loss in keeping the machine working continuously. For the water, an overflow-pipe should be provided at any convenient point, and the amount of water displaced by the ore at each filling of trucks will thus be lost, and has to be made up either by an inflow-pipe or by buckets of water. Except in the case of ores heavily charged with argillaceous matter, this is all the water-supply that is really needed. Keep the tank full of water, and it will always be clear enough for working purposes, as the current is never fast enough to allow it to get thick. "Patentee's Terms. —Mine-owners are invited to erect Sutherland's machines according to these plans and instructions, the nominal fee of Is. royalty being charged for first six months' use of any machine, and £25 for each succeeding half-year. Further inquiries and bags of ore for trial (crushed, and carriage paid) should be sent to G. Sutherland, 11, Lytton Street, Carlton, Melbourne, or Angas Street, Adelaide."

Goddard's Patent Grinder and Gold-saver. Considerable interest has been evinced during the last few weeks in the trials of a new goldsaving appliance, invented and patented by Mr. H. S. Goddard, engineer, of Uralla, New South Wales, who for over two years has been engaged perfecting the invention. The machine is designed to save floured silver and gold, which ordinarily are lost in tailings from batteries, and the several tests and trials, which have been of the most severe character, and have taken place at Langland's foundry, South Melbourne, resulted successfully. Goddard's patent differs from many appliances in its simplicity, efficiency, and cheapness. It consists of a circular pan, the bottom and sides of which are lined with grooved haematite iron, in which works a muller, also with grooved bottom and sides, the grooves being placed at opposite angles to those in the pan. The weight of the muller is about 9cwt., and it revolves in the lined pan at the rate of 150 revolutions per minute, its action on tailings running direct from the battery being to grind them fine as roller flour. The pan is fed from the centre of the muller at the rate of 9cwt. per hour, and can be automatically fed from a battery, thereby saving an immense amount of labour and attention. After grinding is completed the material passes through the inner amalgamator, charged with quicksilver, and the centrifugal action of the muller throws the fine sand over the edge of the pan into a ring-well, also charged with quicksilver; so that it is impossible for gold to pass. The sand is kept agitated by several fingers revolving in the outer well, and is there discharged with the waste water at a spot in the outer casing of the machine. The wearing parts being of white haematite iron, are very durable, and are easily renewed any time. It is said that the machine now at work will receive and grind as much as can be delivered from a five-head battery, with gratings of forty-one holes to the inch, thus effecting a material saving in cost of crushing and treating, leaving the residue finer than that from an ordinary battery. Tables and blankets are entirely dispensed with. The machine is further specially adapted for the treatment of fine gold, and should prove a desirable acquisition where flake or floured gold is lost. We are informed that it has been successfully tried in the Hillgrove district, in New South Wales, where a quantity of tailings from the Eleanora Gold-mine, which gave by fire-assay sdwt. 9gr., were treated, and resulted in return of 4dwt. 15gr. Tailings from illpine Gold-mine, at Swamp Oak, which assayed by fire 23dwt., were also put through the pan, giving a result of 21dwt. A parcel of quartz from the Great Britain claim, at the same place, which crushed about 60z., gave 9oz. 13dwt. lgr. Two tons of tailings from Bussell's Amalgamated Company, Victoria, which had been treated at the modern battery of that company with 240-mesh gratings, gave a return of 2}dwt. per ton. xlnother two tons from the same company gave 4dwt. per ton, both from the new machine. Three trucks of tailings from Eaglehawk district (different claims) are being treated at present. The first lot of two tons gave 3dwt. to the ton ; the others are being put through, and the amalgam promises encouraging results. A large number of other orders are on hand. The machine can be made in sizes suitable for five, ten, fifteen, or twenty head of stamps. It will feed itself, is speedier than the usual chlorination process, and does not lose a grain of quicksilver. The agents, Messrs. Thomas Scott and Company (Limited), 99, Queen Street, Melbourne, state that the patent rights in all the colonies, Great Britain, America, and South Africa have been purchased by a syndicate of Victorian and New South Wales gentlemen, who propose forming a large public company to work all the places named. The machines will be manufactured under the personal superintendence of the inventor, who is a practical engineer, and applied to the clearing up of tailings everywhere.— Australian Mining Standard.

The Noble Gold-mining Process. A new process, which bids fair to be of great importance in gold-mining, is about to be introduced by the Noble Mining and Milling Company of New York, a company recently organized