Jan. 26.] THE NEW ZEALAND GAZETTE. 403

No. 28853.—8th December, 1910.—NIKOLA TESLA, of Waldorf-Astoria, corner of 5th Avenue and 34th Street, Manhattan, New York, United States America, Engineer. Improvements in fluid propulsion.

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Claims.—(1.) The method of imparting energy to or deriving it from a fluid, based on adhesive and viscous action, which consists in admitting the fluid to the central or peripheral portion of a rotably arranged system and causing it to flow, under the combined action of radial and tangential forces, in a spiral path towards the periphery, or the axis, of the rotating system, as set forth. . . . (6.) A fluid-propelling or fluid-propelled machine consisting in the combination of a shaft, a plurality of discs spaced apart and mounted on the same, and ports or passages of inlet and outlet adjacent to the centre and periphery of said discs, as set forth.

[NOTE.—Here follow five other claims.]

(Specification, 13s. 9d.)

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No. 28874.—14th December, 1910.—ROBERT JOUGHIN, of Matamata, New Zealand, Farmer. Improved method and means of creating a vacuum and retaining the same at a constant.

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Claims.—(1.) The improved method and means of creating a vacuum comprising a vessel sunk into the ground and containing water to form a seal, a second vessel telescoping within said first vessel and having an open bottom and closed top, a valve located in the top of said second vessel, a vacuum pipe passing down within said first vessel and passing up within said second vessel to above the water-level, and means to raise the said second vessel in order to retain a constant vacuum therein, substantially as set forth. (2.) The improved means of creating a vacuum and retaining the same at a constant, combined, arranged, constructed, and operating substantially as specified, and illustrated in the drawing.

(Specification, 2s. 9d.)

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No. 28879.—15th December, 1910.—FREDERICK GOSS, of Millicent, South Australia, Postmaster. Improvements in and relating to alarm-clocks.

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Extract from Specification.—This invention comprises improvements which enable an alarm clock to sound at a series of predetermined times to give reminders of duties or appointments. If alarms are wanted at, for example, 9.30 and 12.30 daily, the handles of two of a series of contact-plates fitted around the clock-face will be set or moved forward and be left so till either alarm is no longer needed, upon which the proper plate will be retracted. In a modification there are fixed clock-face contact-plates and a connection from each to a switch-board where plugs or movable connectors will be set in contact with appropriate plug blocks when alarms are desired.

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

(Specification, 9s. 6d.)

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No. 28882.—21st February, 1910.—JAMES DRAGE, of Ivanhoe Gold Corporation, Limited, Boulder, Western Australia, Engineer. Improvements in filtering-machines.

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Claims.—(1.) In a pulp-filtering machine, a succession of filtering-wheels operating in a succession of tanks consisting of filtering-frames arranged in a series of parallel circles on said wheels, and connected by radial pipes or hollow spokes to a boss, said boss having a circle of port-holes for vacuum and a separate circle of port-holes for air or steam. A valve-cap having a vacuum-chamber and arc-shaped port, and air and steam ports concentrically coincident with those in the boss, removable couplings in wheel-shaft, sight-glasses in vacuum-pipes, buffer bolts and springs in said valves, and automatic pulp-discharge conveyor; agitator-blades arranged to circulate the pulp through perforated partition and upwards around the filter-frames, baffle-plates in agitating-compartments, the whole forming a filtering-machine in series for filtering, washing, and refiltering pulp in a continuous process, and arranged to discharge at the side and internally towards the centre, as described, and illustrated in the drawings. . . . (3.) In a pulp-filtering machine, for removing the pulp from the machine, consisting of an inclined conveyor-belt running on rollers and which is operated by the discharge pulp falling on it. . . .

[NOTE.—Here follows one other claim.]

(Specification, 9s. 9d.)

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No. 28901.—20th December, 1910.—GEORGE JOHNSTON, of 140 West George Street, Glasgow, Scotland, Engineer. Improvements in or relating to filtering-apparatus.

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Extract from Specification.—Filtering-frames arranged singly or in groups are adapted to be moved about a horizontal axis in such a manner that the frames enter the liquid whilst more or less horizontal in position, and thereafter traverse the liquid until at the time of leaving the liquid they again occupy a more or less horizontal position, but with the reverse side uppermost. Whilst any frame or group of frames is immersed in the liquid it is automatically placed in communication with an air-pump or the like, but immediately it leaves the liquid such communication is automatically interrupted, and the frames afterwards cleaned of the impurities attached to their outer surfaces prior to again entering the liquid, the said cleaning being effected, for example, by means of a liquid applied externally to the frames, by means of fluid under pressure, such as air, supplied internally to the frames in a manner per se known, or by both of these means in combination, as may be found most convenient in practice.

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

(Specification, 4s. 9d.)

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No. 28902.—20th December, 1910.—GEORGE JOHNSTON, of 140 West George Street, Glasgow, Scotland, Engineer. Improvements in or relating to crushing or grinding auriferous quartz and other hard ores or substances.

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Extract from Specification.—Ore is crushed or ground by feeding it, with or without water, at a comparatively slow velocity—say, of the order of several hundred feet per minute—and in a comparatively thin stream, between a pair of rolls, one of which is made of small diameter and the other of relatively large diameter, and both of which have a high peripheral velocity of the order of, say, ten thousand feet per minute and upward, so that the successive portions of the stream of material are practically subjected individually to a sudden nipping or crushing action between the adjacent portions of the rolls in a manner analogous to that which would result if pieces of hard material were fed consecutively between a rapidly acting hammer and an anvil. In this way a large quantity of ore can be easily, quickly, and cheaply dealt with. In apparatus suitable for carrying out the invention it is advantageous to use two pairs of small- and large-diameter rolls arranged with their axes parallel, the two smaller rolls being arranged adjacent to each other and between the two larger rolls so that lateral thrust on the smaller rolls is balanced and their bearings thus relieved of undue wear. Two pairs of rolls thus arranged may constitute a milling-unit. One, two, or more such units may be mounted side by side—that is to say, in parallel—upon a common base plate or support, or upon separate base plates or supports, and be driven in any convenient manner from a driving-shaft common to them, suitable ore-feeding means being provided for simultaneously feeding ore between each pair of rolls.

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

(Specification, 6s. 6d.)