Sept. 19.] THE NEW ZEALAND GAZETTE. 1875

to rotate therewith, and gearing intermediate said sliding-shaft and tool-carrier whereby the reciprocation of the latter is effected, substantially as shown and described.
(Specification, 11s. 3d.; drawings, 4s.)

No. 13578.—3rd May, 1901.—GEORGE AUGUSTINE TAYLOR, of Paddington, near Sydney, New South Wales, Artist. An improved fibrous plaster.

Claims.—(1.) A fibrous plaster composed of a quick-setting cement and the shredded fibres of bagasse, substantially as described. (2.) A fibrous-plaster composition composed of Roman or Keen’s cement, or plaster-of-paris, with 10 to 25 per cent. of shredded bagasse-fibre, substantially as described. (3.) A fibrous-plaster product composed of a number of layers of quick-setting cement or plaster superimposed, whereof the facing layer is composed of nearly pure plaster or cement and the backing layers of quick-setting plaster or cement intermixed with shredded bagasse, substantially as described.
(Specification, 3s. 6d.)

No. 13619.—16th May, 1901.—ALEXANDER KNOX, of 10 Imperial Chambers, 91 Pitt Street, Sydney, New South Wales, Merchant. An improved fibrous plaster.

Claims.—(1.) A fibrous plaster composed of quick-setting cement and the shredded fibres of bagasse, substantially as described. (2.) A fibrous-plaster composition composed of Roman or Keen’s cement, or plaster-of-paris, with 10 to 25 per cent. of shredded bagasse-fibre, substantially as described. (3.) A fibrous-plaster product composed of a number of layers of quick-setting cement or plaster superimposed, whereof the facing layer is composed of nearly pure plaster or cement, and the backing layers of quick-setting plaster or cement intermixed with shredded bagasse, substantially as described.
(Specification, 3s.)

No. 13855.—23rd July, 1901.—JOHN VOLKNER, of Grey Street, Auckland, New Zealand, Tinsmith. An improved egg-beater.*

Claim.—An improved egg-beater constructed of flat iron plates which are spiral-twisted, as shown on plan and described in the specification.
(Specification, 1s. 6d.; drawings, 2s.)

No. 13891.—3rd December, 1900.—ROBERT MCKNIGHT, of 2837, Boudinot Street, Philadelphia, Pennsylvania, United States of America, Metallurgist. Improvement in the art of recovering metals from ores.

[NOTE.—This is an application under section 106 of the Act, the date given being the official date of the application in the United States of America.]

Claims.—(1.) The process which consists in preparing a charge containing the ore, a member of the oxygen or nitrogen group not being either of them oxygen or nitrogen, and a haloid compound of an alkaline metal, the proportions of the materials being substantially those quantitatively requisite to produce, when heated in the presence of oxygen, a haloid salt of the metal to be extracted from the ore, and an oxysalt of one of the metalloids of the classes above mentioned, and the alkaline metal, and subjecting the charge to an oxidizing roast at a temperature sufficient to effect the reaction mentioned, and volatilising and recovering the metal-values as haloid salts or oxyhaloid salts, substantially as described. (2.) The process which consists in preparing a charge of a mixture containing the ore, sulphur, and a haloid salt of an alkaline metal or an alkaline-earth metal, the proportions of the materials being substantially those quantitatively requisite to produce, when heated in the presence of oxygen, a haloid salt of the metal or metals to be extracted from the ore, and a sulphate of the alkaline or alkaline-earth metals, subjecting the charge to an oxidizing roast with agitation at a temperature sufficient to effect the reaction mentioned, and volatilising and recovering the metal-values as haloid salts or oxyhaloid salts, substantially as described. (3.) The process which consists in preparing a charge containing a mixture of the ore, sulphur, and a chloride of an alkaline or an alkaline-earth metal, the proportions of the materials being substantially those quantitatively requisite to produce, when heated in the presence of oxygen, a chloride of the metal to be extracted from the ore, and a sulphate of the alkaline or alkaline-earth metal, subjecting the charge to an oxidizing roast with agitation at a temperature sufficient to effect the reaction mentioned, and volatilising and recovering the metal-values as chlorides or oxychlorides, substantially as described. (4.) The process which consists in preparing a charge containing a mixture of the ore, sulphur, and chloride of sodium, the proportions of

the material being substantially those quantitatively requisite to produce, when heated in the presence of oxygen, the chloride of the metal to be extracted, and a sulphate of sodium, subjecting the charge to an oxidizing roast with agitation at a temperature sufficient to effect the reaction mentioned, and volatilising and recovering the metal-values as chlorides or oxychlorides, substantially as described. (5.) In the art of extracting metals from ores, mixing said ore with materials to react therewith to produce volatile compound of the metal to be recovered, subjecting same to an oxidizing roast in which the upper surface of the ore is brought in contact with the heat, and drawing downwards through the ore the volatilised compounds of the metals to be recovered, and collecting same, substantially as described.
(Specification, 4s. 6d.)

No. 13898.—13th August, 1901.—JOSEPH HENRY RASHLEIGH, of Ferguson Street, Palmerston North, New Zealand, Painter. An improved bridle or protector for paint- and like brushes.

Claims.—(1.) A bridle for paint- and like brushes formed of suitable material such as indiarubber, such bridle being joined together with solution and secured round the bristles to form a kind of ferrule, and can be rolled down to any length to suit the amount of bristles required by the worker as the bristles of the brush wear. (2.) A bridle for paint- or other brushes formed of indiarubber, and separate from the brush. It can be suitably rolled down in the manner and for the purpose set forth. (3.) The bridle which is separate from the brush and formed of suitable material such as indiarubber and rolled down to any suitable length, as described, and illustrated in drawings.
(Specification, 2s. 3d.; drawings, 3s.)

No. 13918.—20th August, 1901.—GEORGE WESTINGHOUSE, of Westinghouse Building, Pittsburg, Pennsylvania, United States of America, Manufacturer (assignee of William John Knox, of Edgewood Park, Allegheny County, Pennsylvania aforesaid, Chemist). Improvements relating to the supply of heat to receptacles such as coking-ovens, annealing-ovens, and the like.

Claims.—(1.) The described method of heating materials which consists in raising a gas to a suitable temperature, passing the same into the vicinity of the materials to be heated, thereafter cooling the gas and again reheating it and continuing the operation. (2.) The method of maintaining a high temperature by continuously circulating a gaseous fluid through a closed circuit, the fluid being heated at a point in the circuit before it enters the region where the temperature is to be maintained, and cooled as it passes from that region, and periodically reversing the direction of the circulation. (3.) The method of manufacturing coke substantially as described. (4.) The method of heating and regulating the temperature in annealing-ovens and other receptacles where materials are to be treated, by circulating a gaseous fluid which is heated before it enters the oven or receptacle, and regulating or varying the velocity or direction of the circulation substantially as described. (5.) The combination with a receptacle in which materials are to be treated, of a heating-stove, a cooling-stove, and means for causing a circulation of gas into the heating-stove and thence through the receptacle and the cooling-stove, either with or without a vessel containing reagents through which the circulating gas is passed in order that it may be denuded of its harmful constituents before entering the receptacle, substantially as and for the purpose specified.
(Specification, 7s. 6d.; drawings, 1s.)

No. 13919.—20th August, 1901.—GEORGE WESTINGHOUSE, of Westinghouse Building, Pittsburg, Pennsylvania, United States of America, Manufacturer (assignee of William John Knox, of Edgewood Park, Allegheny, Pennsylvania, United States of America, Chemist). Improvements in or relating to a process and apparatus for the manufacture of gas.

Claims.—(1.) The improvement in producing gas which consists in heating a portion thereof to a high temperature, passing the same into the producer again, cooling the gas to a minimum temperature with storage of heat, withdrawing a portion of the cooled gas and causing the remainder to repeat the cycle. (2.) In the process described, passing the gas from the producer into a distilling-apparatus wherein a considerable portion of the heat of the gases is abstracted and utilised in carrying on gasification. (3.) A modification of the process described, in which the gases, after leaving the producer, are caused to pass through a fixing- or cooling-stove in which a portion of the heat therein contained is utilised or stored, either with or without a steam-raising plant through which the gases pass before reaching the