Sept. 21.] THE NEW ZEALAND GAZETTE. 2309

No. 19863.—10th August, 1905.—GEORGE SKAATS MAYHEW, of 2, Basinghall Avenue, London, England, Engineer. Improved fireproof wooden-cored plaster slab for building and other purposes.

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Claims.—(1.) The process for producing a wooden-cored plaster slab in a continuous sheet consisting in coating a thick plaster face on both sides of a perforated wooden core and pressing said plaster faces so that said faces are locked to the core through said perforations. (2.) The process for producing a wooden-cored plaster slab in a continuous sheet consisting in perforating a compo.-board core in lines, distributing a thin coating of sizing material over said perforated compo.-board core, drying said sized core on both sides, feeding ridges or lines of thick plaster on both sides of said perforated core, and pressing the faces of the core when completely coated with lines of plaster so that said lines of plaster are locked to the core through said perforations and are formed with the core into a solid plaster slab. (3.) The process for producing a wooden-cored plaster slab in a continuous sheet consisting in perforating a compo.-board core with lines of perforations at regular intervals, feeding ridges or lines of thick plaster over said lines of perforations on both sides of said perforated core, forming said lines of plaster into regular rows, drying said plaster ridged core, reperforating said core between said ridges of plaster, feeding lines or ridges of plaster on both sides of said core above said new perforations, and pressing the faces of the core when completely coated with lines of plaster so that said lines of plaster are locked to the core through said perforations and are formed with the core into a solid plaster slab. (4.) A wooden-cored plaster slab, produced in a continuous sheet, consisting of a perforated wooden core and a thick plaster coating on both sides firmly pressed and locked on to said core through said perforations. (5.) A wooden-cored plaster slab, produced in a continuous sheet, consisting of a perforated compo.-board core and a thick plaster coating on both sides fed on to said core in regular rows corresponding with said lines of perforations and firmly pressed and locked on to said core through said perforations. (6.) A wooden-cored plaster slab, produced in a continuous sheet, consisting of a plaited core and a thick plaster coating on both sides firmly pressed and locked on to said core through the perforations in the plaited core. (7.) In a machine for forming a plaster slab with a plaited core of the character described, the combination of a pair of feeding-rollers, upper and lower cement-rollers adapted to distribute a thin coating of sizing-material evenly over the faces and perforations of said core, a hot-air chamber adapted to dry said core on both sides, a pair of upper and lower plastering-tanks provided with a series of spouts adapted to feed lines or ridges of thick paste or plaster on both faces of the core, a pair of adjustable grooved rollers adapted to be moved into a position to form said lines of plaster into regular rows, and a pair of adjustable flat rollers adapted to be moved into a position to press the faces of the core when completely coated with lines of plaster into a solid plaster slab. (8.) In a machine for forming a plaster slab with a perforated compo.-board core of the character described, the combination of a pair of feeding-rollers, perforating and countersinking rollers adapted to perforate the core and countersinking the perforations on both sides of the core, a pair of cleaning-rollers adapted to remove any particles of wood or paper left adhering to the core, upper and lower sizing-rollers adapted to distribute a thin coating of sizing-material evenly over the faces and perforations of said core, a hot-air chamber adapted to dry said core on both sides, a pair of upper and lower plastering-tanks provided with a series of spouts adapted to feed lines or ridges of thick paste or plaster on both faces of the core over the lines of perforations, a pair of adjustable grooved rollers adapted to be moved into a position to form said lines of plaster into regular rows, and a pair of adjustable flat rollers adapted to be moved into a position to press the faces of the core when completely coated with lines of plaster into a solid plaster slab. (9.) In a machine of the character described, guides or stops for adjusting the position of the core in the machine, substantially as described. (10.) In a machine for forming a plaster slab with a perforated wooden core, the construction and arrangement of parts substantially as described and shown in Figs. 5 and 6 of the drawings.

(Specification, 9s.; drawings, 2s.)

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No. 19865.—10th August, 1905.—DANIEL CORCORAN, of No. 33, George Street, Launceston, Tasmania, Australia, Grocer. An improved device for measuring liquids.

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Extract from Specification.—This invention relates to a device for accurately measuring liquids which may be readily discharged of its contents. It consists of a glass or other transparent tube marked with graduations, and pivot-

ally suspended from a clamping-bracket in such a manner as to retain the surface of the liquid therein at spirit-level. At the bottom of the tube is a detachable funnel provided with a cock by which the measured quantity may be transferred to another receptacle.

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

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

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No. 19866.—10th August, 1905.—AKTIEBOLAGET SEPARATOR, a corporation existing under the laws of Sweden, and having their place of business at 8, Fleminggatan, Stockholm, Sweden, Manufacturers (assignees of Anders Johan Ericsson, of 8, Fleminggatan aforesaid, Engineer). Improvements relating to centrifugal separating-apparatus.

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Claims.—(1.) In centrifugal separating-apparatus, which for the purpose of carrying away the solid matters stratified on the inner wall of the bowl are provided with rotating scoop-discs operated by gearing from a separate driving-shaft, the means consisting of one or more inclined shields fastened either on the bowl or on the guide-disc of the scoop-discs in such a manner that the heavier particles thrown out from the scoops nearer to the centre of the bowl opposite to the shields are caught by these shields and slide along the same out through the openings in the bowl. (2.) In the device indicated in claim 1, the improvement that the shields themselves or prolongations of the shields are scraped off by scrapers which convey the solid matters to the outlet. (3.) In the device indicated in claim 1, the improvement that the scoops or the scoop-discs have such an inclined form that the solid matters slide off the same in an oblique direction over to the shields mentioned in claim 1.

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

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No. 19867.—10th August, 1905.—AKTIEBOLAGET SEPARATOR, a corporation existing under the laws of Sweden, and having their place of business at 8, Fleminggatan, Stockholm, Sweden, Manufacturers (assignees of Birger Ljungstrom, of 8, Fleminggatan aforesaid, Engineer). Improvements relating to centrifugal separating-apparatus.

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Claims.—(1.) In centrifugal separating-apparatus of the kind provided with a liner dividing the bulk of the liquid into layers thin in the direction of the radius, the improvement consisting in that outside the liner, between the same and the inner wall of the bowl, one or more obliquely arranged scrapers are located, said scrapers being put in a rotary motion relatively to the bowl and to the liner by means of a separate driving-shaft in order that the solids stratified on the inner wall of the bowl may be scraped down along the wall of the bowl and further be carried off from the bowl in a suitable manner. (2.) A constructional form of the device claimed in the first claim characterized thereby that the obliquely running scrapers are arranged on a trellised drum.

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

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No. 19868.—10th August, 1905.—AKTIEBOLAGET SEPARATOR, a corporation existing under the laws of Sweden, and having their place of business at 8, Fleminggatan, Stockholm, Sweden, Manufacturers (assignees of Anders Johan Ericsson, of 8, Fleminggatan aforesaid, Engineer). Improvements relating to centrifugal separating-apparatus.

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Claim.—In centrifugal separating-apparatus of the kind having scoop-discs located in the centrifugal bowl and driven by a separate shaft and moving planetwise along the periphery of the bowl, the improvement which consists of scrapers partially embracing the scoop-discs and having their points near to the periphery of the bowl and directed with the motion of the separate shaft relative to the bowl in order that the solid matters may be caught by the points of the scrapers and be carried further by the scoop-discs, whereby the scrapers act as guides.

(Specification, 3s.; drawing, 1s.)

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No. 19873.—8th August, 1905.—JOHN HERCUS, Agent, FREDERICK WILLIAM BARTON, Gardener, and WILLIAM MORTON, Mechanical Engineer, all of Dunedin, New Zealand. An automatic food-protector for domestic animals and birds.

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Claims.—(1.) In feeding-boxes for supplying artificial food to domestic animals or birds, in combination, the feeding-receptacle, with a door arranged that it moves away when said animal or bird for which said food was intended steps on a platform, to which it is so connected that by depressing