Dec. 1.] THE NEW ZEALAND GAZETTE. 2805

is or are overcome as explained, and the pressure is utilised with a sudden impulse and at its full intensity at each end of the piston or hammer alternately to actuate the piston.

[NOTE.—The above extract from the specification is inserted in place of the claims.]

(Specification, £1 4s.; drawings, 8s.)

No. 20133.—5th October, 1905.—FREDERICK MACKAY, of 30, Elizabeth Street, Melbourne, Victoria, Australia, Managing Director of the Coal Creek Proprietary Company, and ALFRED JAMES BECKWITH, of 25, Darling Street, South Yarra, near Melbourne aforesaid, Gentleman (assignees of John Collins Clancy, of Footscray, near Melbourne aforesaid, Analytical Chemist and Metallurgist). Improvements in the extraction of gold, silver, lead, zinc, and other metals, and the production of lead-sulphate from mixed or complex sulphide ores.

Extracts from Specification.—According to our invention we dispense with the preliminary roasting and the use of fluxes and coke, and obtain the complete desulphurization or oxidation of the sulphides and at the same time using the heat generated in the oxidation of the sulphides to sulphates and oxides of their corresponding metals during the continuous charging of the ore-dust and air into a heated chamber in one operation, with or without the use of extraneous heat such as carbonaceous fuel or mixing the pulverised ores with coal-dust or products of carbonaceous fuel, &c. We pulverise the raw sulphide ore or metallurgical product to a condition of ore-dust or to a very finely divided form or comminuted state by means of an efficient pulveriser. The pulverised ore now in the state of ore-dust is forced or blown by means of a fan or by means of an induced or natural air-current into a heated chamber made of fire-resisting material. . . . Connected with the chamber is a small gas producer for the purpose of heating the chamber to the ignition-point of the finely divided metallic sulphides, and the ignition-point can be maintained without further aid of extraneous heat provided the ore is rich enough in volatile metal or metallic sulphides. . . . The fume and now desulphurized ore-dust passes with the oxidized sulphur gases into a series of brick or other flues provided with settling-chambers, so as to allow the said ore-dust room to expand, cool, and drop its solid particles. The fume that is lead-sulphate and some zinc-oxide is sucked by means of a fan and made to pass into calico filtering-apparatus, well known and in use for the capture of lead fume. This may be collected and smelted for the recovery of its metallic contents, or treated by known methods, or sold as white pigment. . . . The desulphurized ore-dust, which may contain gold, silver, or other metals, being insoluble, is smelted for the recovery of those metals, or may be treated by other known metallurgical methods. The oxidized sulphur gases which pass with the fume from the fume-chamber may be utilised for leaching out the zinc from the desulphurized ore-dust if necessary.

[NOTE.—The above extracts from the specification are inserted in place of the claims.]

(Specification, 6s.)

No. 20137.—5th October, 1905.—HENRY L. LIGHTNER, of 1310, Guerrero Street, Mining Engineer; WILLIAM PRIEST, of 3512, 25th Street, Model-maker; and HENRY FEIGE, of 1068, Capp Street, Builder; all of San Francisco, California, United States of America. Apparatus for recovering precious metals.

Claims.—(1.) In an apparatus of the character described, comprising a device having an extended surface over which the pulp can be moved, means for discharging pulp thereon, and means for causing jets of air to be directed towards said surface to continually drive the pulp over said surface, substantially as described. (2.) In an apparatus of the character described, the combination of a device having an extended surface over which pulp can be moved, means for discharging pulp on to said surface, an air-supply pipe over said surface, a series of nozzles carried by said pipe and discharging the air against the pulp on said surface, and means for rotating said pipe relatively to the surface, said nozzles being so directed that by successive impulses from the jets of air therefrom the particles of pulp are continually moved in a uniform direction relatively to the surface to separate the lighter particles from the heavier, substantially as described. (3.) In an apparatus of the character described, the combination of a device having a circular extended surface over which pulp may be moved, means for discharging pulp on to said surface, a series of pipes extending over said surface, nozzles carried by said pipes and discharging air against the pulp on to said surface, said nozzles being directed to operate upon the lighter portion of the pulp and move it either to the centre or to the circumference, leaving the heavier particles upon said surface, substantially as described. (4.) In an apparatus of the character described, the combination of a vessel having a circular amalgamated concaved surface, means for supplying pulp upon the central portion of said surface, an air-blast apparatus comprising radial outlets capable of discharging air-jets directly upon the surface in a downwardly and outwardly direction, whereby the pulp is carried up the incline and the waste portion thereof is discharged, substantially as described. (5.) In an apparatus of the character described, the combination of a vessel having a circular amalgamated concaved surface, means for supplying pulp up n the central portion of said surface, a pipe adapted to contain mercury, the outlet end of said pipe being raised to a predetermined height to determine the level of the mercury on said surface, an air-blast apparatus comprising radial outlets capable of discharging air jets directly upon the surface in a downwardly and outwardly direction whereby the pulp is carried up the incline and the waste portion thereof is discharged, substantially as described. (6.) In an apparatus of the character described, the combination of a pan having an amalgamated concaved surface and a raised centre forming an annular trough, a receiver for pulp suspended above the pan-centre and having discharge-openings around the centre, an air-blast apparatus comprising an air-pipe extending through the bottom of the receiver, radial arms extending from the air-pipe and having air-discharge openings, and mechanism whereby the arms are revolved, substantially as described. (7.) In an apparatus of the character described, the combination of a vessel having a surface over which pulp may be moved, means for discharging pulp on to said surface, pipes extending over said surface and having perforations whereby jets of air are discharged against the pulp thereon, and means for gradually separating said pipes and the bottom of the vessel as the vessel is filled, substantially as described. (8.) In an apparatus of the character described, the combination of a vessel having a surface over which pulp may be moved, means for discharging pulp on to said surface, pipes extending over said surface and having perforations whereby jets of air are discharged against the pulp thereon, means for rotating said pipes, and means for gradually separating said pipes and the bottom of the vessel as the vessel is filled, substantially as described. (9.) In an apparatus of the character described, the combination of a vessel having a surface over which pulp may be moved, having openings at its periphery and means for adjustably controlling said openings, means for discharging pulp on to said surface, pipes extending over said surface and having perforations whereby jets of air are discharged against the pulp thereon, and means for gradually separating said pipes and the bottom of the vessel as the vessel is filled, substantially as described.

(Specification, 11s.; drawing, 3s.)

No. 20160.—10th October, 1905.—BRENDA ARNOT, of Lincoln Road, Masterton, Wellington, New Zealand, Artist. Improved cooking-apparatus for use with gas-burners.

Extract from Specification.—The apparatus comprises a tray made of tinplate, upon which the burner rests. A ring of similar metal surrounds the tray, and has a gap through which the neck of the gas-burner passes. The top of the ring is provided with cross-bars for supporting cooking-utensils. Ordinary cooking-utensils may be used, but for roasting I provide a special utensil made in two parts joined together and secured by a clip at the end of handles whereby the utensil is manipulated.

[NOTE.—The above extract from the specification is inserted in place of the claims.]

(Specification, 2s. 6d.; drawing, 1s.)

No. 20170.—12th October, 1905.—PETER ANDERSEN, of Langdrathof, Hadersleben, Prussia, Germany, Farmer. Improvements in milking-apparatus.

Claims.—(1.) The combination in a milking-machine of a separate pump and connections for each teat of the animal being milked, a common crank shaft for actuating the pumps, outlets for the pump-barrels, a non-return valve on the suction inlet to the pump, an air-valve connected with such inlet, and means for connecting the pump with the udder of the animal, all substantially as set forth. (2.) In a milking-apparatus, a milking-cup constructed of solid material and arranged to attach itself directly to the udder of the animal being milked without pressure on the teats, substantially as set forth. (3.) The combination in a milking-machine of a separate pump and connections for each teat of the animal being milked, a common crank shaft for actuating the pumps, outlets for the pump-barrels, a non-return valve on the suction inlet of the pump, an air-valve connected to such inlet, a solid milking-cup connecting to the udder of the animal without pressure on the teats, and a detachable tube connecting the milking-cup with the pump, all substantially as set forth.

(Specification, 4s. 6d.; drawings, 2s.)