Jan. 7.] THE NEW ZEALAND GAZETTE. 99

pressure, emulsions, solutions, and the like to a dry condition, concentrating the liquid, consisting in causing the same to flow from the chamber or place where it comes into contact with the cylinder-shaped rotary body mounted in the liquid-receptacle—from which rotary body the dry residue produced by evaporation is scraped—in a circulating current effected by means of a pump or the like many times over suitable surfaces, especially the end walls, of the said body, so that it is frequently brought into contact with said surface under constant supply of heat, substantially as described. (4.) In combination, the pipes, such as 7, 8, mounted along the side walls or end walls of the rotary body, and provided with a number of outlet-openings formed in the side facing the said walls, which pipes extend from a pump communicating with that part of the interior of the liquid-receptacle where the fluid can settle, in order to produce a circulating current of liquid flowing over the end walls, substantially as described. (5.) An evaporating-apparatus, the active metallic surface of which—adapted to be heated and on which the material is evaporated, and from which the dried product is scraped off—is composed of a plate or structure of nickel or suitable nickel alloy (such as nickel-cobalt alloy), which by hammering, rolling, pressing, or like operation has been given great hardness, in order to afford a surface which resists the chemical action of the acids or salts of the material treated, so that the dried substance is not contaminated with impurities, while at the same time it has great heat-conductivity, so that the evaporation proceeds with rapidity, substantially as described. (6.) A rotary evaporation-device consisting of a rotary drum provided with a metallic evaporation surface of the kind described in claim 5, said drum having double walls and dished or corrugated bottoms and a perforated partition wall concentrically mounted about the drum-shaft between the double walls, said wall being adapted to cause the heating medium introduced through the hollow shaft of the drum to pass over the entire interior surface of the drum. (7.) A rotary evaporation-device comprising a rotary drum with double walls and dished or corrugated bottoms and with perforated partition wall mounted concentrically about the drum-shaft and between the double walls, and about which the heating medium can circulate, said wall being connected with the shaft by radial tubes, which tubes place the shaft in communication with the chamber in the drum outside the concentric wall, while openings in the shaft, between which and the tubes there is no direct communication, place the chamber between the bottoms 14, 15, and the chamber between the concentric partition wall and the inner wall in communication with the shaft, in order to obtain such a circulation of the heating-medium within the drum that the entire interior surface of the latter is subject to the heat, substantially as described. (8.) A modification of the device described in claim 7, wherein the radial tubes are replaced by a circular partition wall 21 at right angles to the shaft and extending to the concentric tube or wall, which circular wall separates the inlets and outlets in the shaft from one another and fits closely to the concentric tube, substantially as described. (9.) A modification of the device described in claim 7, wherein the radial tubes are replaced by two walls situated close together and traversed by cross-tubes 22, and between which there are openings in the concentric tube, substantially as described. (10.) The complete liquid concentrating and evaporating apparatus substantially as described, or illustrated in the drawings.
(Specification, 9s. 6d.; drawing, 2s.)

No. 17329.—5th December, 1903.—WATTS GOODWIN, of Tuapeka Mouth, Otago, New Zealand, Miner. Improved apparatus for operating and sustaining window-sashes.

Claims.—(1.) Apparatus for operating and sustaining window-sashes in their frames, comprising the parts arranged, combined, and operating substantially as specified and illustrated. (2.) In apparatus for the purpose indicated, in combination, a window-sash, a cam pivoted in a bracket thereon, a ring upon said bracket, and an extension integrally formed with the cam, substantially as and for the purposes specified.
(Specification, 2s.; drawing, 1s.)

No. 17334.—4th December, 1903.—PAUL DU BUIT, of 15, Rue des Halles, Paris, France, Engineer. Improvements in the manufacture of explosive charges.

Claims.—(1.) The arrangement of charges of explosives for firearms consisting essentially in diminishing the total surface while allowing ready ignition, this result being obtained by making the charge of a sheet, or, if need be, of several sheets, of a thickness varying with the rate of burning sought; this sheet being rolled up in spiral form, but cut on its lower side more or less deeply in the form of comb-teeth or fringe so as to insure more or less rapid ignition. (2.) In a charge of explosive made up as described in the preceding claim, the arrangement consisting in cutting the edge of the sheet constituting, when rolled up, the charge, over a portion only of its length in such a way that, when rolled up, the cut portion is protected against deformation by the uncut portion. (3.) In a charge of explosive such as that described in the two preceding claims, the application of cuts in the form of teeth of greater or less length and width, capable of being separated by greater or less empty spaces, or no space at all, the incisions reaching, if so required, through only a portion of the thickness of the sheet.
(Specification, 4s. 6d.; drawing, 2s.)

No. 17339.—8th December, 1903.—JOHN PRATT ANDREWS, of Waikuku, Canterbury, New Zealand, Flax-miller, and JOHN ANDERSON, of Christchurch, Canterbury aforesaid, Engineer. Improved apparatus for truing up the beater-drums of flax-strippers.

Claims.—(1.) Improved apparatus for truing up the beater-drums of flax-stripping machines, consisting of the parts combined, arranged, and operating substantially as and for the purposes specified and illustrated. (2.) In apparatus for truing up the beater-drums of flax-stripping machines, the combination of a tool-holder secured to the base plate of the machine, a cutting-tool secured therein, means for adjusting said tool to the periphery of the drum, and means for revolving the drum, substantially as specified and illustrated.
(Specification, 1s. 6d.; drawings, 2s.)

No. 17342.—9th December, 1903.—LEONARD SCHADE VAN WESTRUM, of 90, Wilhelm Strasse, Berlin, Germany, Engineer, at present residing at the Coburg Hotel, Carlos Place, Grosvenor Square, London, England. An improved method of road-making.

Claim.—Method of road-making, more especially macadamised roads and the like, characterized by the fact that as binding-material for the materials forming the road-surface, such as broken stones, sand, earthy constituents, or the like, a solution or emulsion of oily substances, such as naphtha, petroleum, tar, and other oils or the like, in water is employed for the purpose of obtaining an intimate and permanent binding-together of the materials.
(Specification, 2s. 6d.)

No. 17343.—9th December, 1903.—GUSTAF GRÖNDAL, of Djursholm, Sweden, Engineer. Improvements in reducing iron-ore to iron-sponge, and in furnaces therefor.

Claims.—(1.) A method of reducing iron-ore to iron-sponge, consisting in heating the ore with carbon by means of a mixture of combustible gas and air, cooling in the furnace the iron-sponge produced by means of one of the components of the gaseous combustible mixture before it is mixed with the other component, leading the products of combustion through suitably arranged passages to and fro through the ore and carbon in the upper part of the furnace, and withdrawing the gases generated during the reduction from the spot where they are generated, substantially as and for the purpose set forth. (2.) A furnace for operating by the method referred to in claim 1, of such form that the charge of ore and carbon can move through it by gravitation, and having an adjustable discharge-opening and substantially horizontal passages from the bottom to the top of the furnace connected with conduits for combustible gas and for air at suitable points, said passages having openings towards the interior of the furnace, substantially as and for the purposes set forth. (3.) The modification in which the furnace is substantially of rectangular cross-section, and has tubes of suitable form arranged in an upper and lower set across the shaft communicating with each other and with a chimney, the lowest tubes of the lower set being connected with a pipe for combustible gas, while the lowest tubes of the upper set are connected with a pipe for air, the tubes for combustible gas being open at the under-side and the tubes for air being perforated on the under-side, substantially as and for the purpose set forth. (4.) The modification in which the tubes of the lower set are connected with the air-pipe, while the tubes of the upper set are connected with the gas-pipe, and in which the wells of the air-tubes have no openings, substantially as and for the purpose set forth.
(Specification, 6s.; drawings, 2s.)

No. 17344.—9th December, 1903.—GUSTAF GRÖNDAL, of Djursholm, Sweden, Engineer. Improvements in and apparatus for magnetic separation of iron-ore.