May 12.] THE NEW ZEALAND GAZETTE. 1297

New York, United States of America (assignees of Frederick Ray, of East Orange, Essex, New Jersey aforesaid, Mechanical Engineer). Improvements in multi-stage centrifugal and similar pumps.

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Claims.—(1.) A centrifugal, turbine, or like pump having a plurality of impellers arranged in series, in which the impellers are provided with separate suctions and means for opening and closing the suctions of the different impellers to take the suction on the first or subsequent impeller according to the discharge-pressure required. (2.) A multi-stage centrifugal, turbine, or like pump, substantially as shown and described in connection with the drawings. (Specification, 2s. 6d.; drawing, 1s.)

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No. 17740.—6th April, 1904.—HENRY R. WORTHINGTON, a corporation organized and existing under the laws of the State of New Jersey, and having its principal place of business at 114, Liberty Street, City, County, and State of New York, United States of America (assignees of Frederick Ray, of East Orange, Essex, New Jersey aforesaid, Mechanical Engineer). Improvements in centrifugal and similar pumps.

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Claims.—(1.) A centrifugal or similar pump having its suction at the hub on one side of the rotary impeller, openings at the impeller-hub for admitting fluid to the back of the impeller, a running joint on the back of the impeller outside said openings, a chamber on the back of the impeller outside said joint, and vanes carried by the impeller running in said chamber. (2.) A centrifugal or similar pump having its suction at the hub on one side of the rotary impeller, openings at the impeller-hub for admitting fluid to the back of the impeller, a running joint on the back of the impeller outside said openings, a chamber on the back of the impeller outside said joint, a chamber on the opposite side of the impeller, and vanes carried by the impeller running in said chambers. (3.) A centrifugal or similar pump, substantially as shown and described in connection with the drawings. (Specification, 3s.; drawing, 1s.)

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No. 17741.—6th April, 1904.—JENS GABRIEL FREDRIK LUND, of Bjorn Farmands Gade 2, Christiania, Norway, Engineer. Improvements in floorings and the like formed of interlocking blocks.

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Claim.—A flooring or a roofing formed of interlocking blocks each of which has a groove and a tongue and which blocks are so arranged in rows extending from one wall or buttress to another that the blocks in the adjacent rows break joint one with another, and that the blocks of each row present to those of the adjacent row on one side a continuous groove and to the row on the other side a continuous tongue, the whole being characterized by the wedge-shaped formation of the tongues, which latter fit into wedge-shaped grooves, the sides of which are of equal inclination, in the adjacent rows in such manner that neither the edges of the blocks above and below the tongues and grooves touch one another, nor do the end faces of the tongues touch the bases of the grooves, in order that the neighbouring rows may be strongly bound together without the use of any binding material, substantially as described. (Specification, 3s. 6d.; drawing, 1s.)

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No. 17743.—6th April, 1904.—JOHN BIGGAR WATERS, of Crawford Street, Dunedin, New Zealand, Merchant; WILLIAM ANDREWS, Engineer, and ARTHUR WARD BEAVEN, Engineer, both of South Belt, Christchurch, Canterbury, New Zealand. An improved apparatus for cleaning rye-grass seeds.

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Claims.—(1.) For the purpose indicated, in combination with apparatus for removing goose-grass seeds and large impurities from rye-grass seeds, a conveyer and elevator for carrying the rye-grass seeds and small impurities to sieves fixed at an angle of about 12° in trays oscillated by a crank of short throw, and having meshes of long holes which permit rye-grass seeds and small impurities to pass through but retain dock-seeds, and having brushes for clearing the meshes of the sieves, and combined with sieves having meshes which retain rye-grass seeds but allow hair-grass and small impurities to pass through, substantially as set forth. (2.) In combination with apparatus for the purpose indicated, sieves fixed in trays oscillated by a crank of short throw, and having a mesh of long holes and set at an angle at about 12° whereby dock-seeds are retained but rye-grass and small impurities are allowed to pass through the sieves, substantially as set forth. (3.) The combination and arrangement of parts comprising the improved apparatus for cleaning rye-grass seeds, substantially as and for the purpose set forth, and illustrated on the drawings. (Specification, 2s. 6d.; drawing, 1s.)

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No. 17746.—8th April, 1904.—ALFRED WEAVER, of Riverslea, Hastings, Hawke’s Bay, New Zealand, Wool-scourer and Fellmonger. Improvements in wool-scouring apparatus.

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Claims.—(1.) In wool-scouring apparatus, in combination, a crate consisting of wooden battens and iron straps and having its ends removable, struts fitting between the straps, means for raising the crate, a bracket supporting the crate and its connections, and a box for holding “scour” and for receiving the crate, as set forth. (2.) In wool-scouring apparatus, in combination, a crate consisting of wooden battens and iron straps and having its end removable, struts fitting between the straps, a bow-shaped bracket supported by the roof of the building, a wheel running on the bracket, chains, blocks, and tackle depending from the wheel and supporting the crate, and a “scour” box divided into two compartments for receiving crates, as set forth. (3.) The combination and arrangement of parts comprising the improvements in wool-scouring apparatus, substantially as and for the purposes set forth, and illustrated on the drawing. (Specification, 2s. 3d.; drawing, 1s.)

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No. 17749.—8th April, 1904.—JAMES SALINGER, of Auckland, New Zealand, Electrician. An automatic alarm for elevators.

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Claims.—(1.) In elevators, metallic strips secured down each side of the well and connected to the respective poles of an electric battery, contact-pieces secured upon each side of the elevator-cage and engaging with the respective strips upon the sides of the well, and an electric bell secured upon the elevator-cage to the respective terminals of which the contact-pieces are connected, substantially as specified. (2.) In elevators, metallic strips secured down each side of the well and connected to the respective poles of an electric battery, contact-pieces secured upon each side of the elevator-cage and engaging with the respective strips upon the sides of the well, an electric bell secured upon the elevator-cage to the respective terminals of which the contact-pieces are connected, and means whereby the engagement of the contact-pieces on the cage with the strips upon the well may be broken at desired points, substantially as specified. (Specification, 2s. 3d.; drawing, 1s.)

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No. 17752.—6th April, 1904.—SOCIÉTÉ DES PRODUITS CHIMIQUES ET D’EXPLOSIFS BERGES CORBIN ET CIE, of 2, Place du Lycée, Grenoble, France, Explosives-manufacturers (assignees of Ernest August George Street, of 56, Rue de Londres, Paris, France, Engineer). Improvements in or relating to the manufacture of explosives and explosive substances.

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Claims.—(1.) Process of manufacturing chlorated explosives consisting in dissolving in a vegetable or animal oil, with heat, a nitro- or an azo-compound (in such proportion that when this oil-mixture is cooled it crystallizes and becomes solid or of pasty consistency), then mixing this solution with one or more finely pulverised alkaline chlorates or perchlorates with or without addition of a carbonated or hydrocarbonated substance, heat being employed to maintain the fluidity of the oily mixture during the whole time of mixing, substantially as described. (2.) The process of manufacturing chlorated explosives in which nitro- or azo-compounds which are little soluble when heated in oils are employed consisting in combining the little soluble substance (nitro- or azo-compound) with a nitro-compound or with an azo-compound to form a combination soluble in oil when heated, and in dissolving this binary combination, with heat, in a vegetable or animal oil (in such proportions that when it is cooled the oil-mixture becomes by crystallization solid or of pasty consistency), and in mixing this solution with one or more finely pulverised alkaline chlorates or perchlorates with or without the addition of a carbonated or hydrocarbonated substance, heat being employed to maintain the fluidity of the oily mixture during the whole operation of mixing, substantially as described. (3.) In the process of manufacturing chlorated explosives, the employment of azo-compounds soluble when heated in mineral oil as azobenzol, oxyazobenzol, substantially as described. (4.) The process of manufacturing chlorated explosives consisting in (a) simply permeating with animal, vegetable, or mineral oil, when heated, either nitro- or azo-compounds, or a combination of nitro-compounds or of azo-compounds, or of one nitro- and one azo-compound; (b) mixing the paste thus obtained with one or more finely pulverised alkaline chlorates with or