Mar. 7.] THE NEW ZEALAND GAZETTE. 893

from the desulphurised and oxidized ore of the remaining volatile oxides (if any) present, substantially as described. (2.) A furnace for the carrying-out of the above process, consisting of a combustion-chamber provided with controllable steam jets and air-inlets, an ore-chamber, and an exit-flue with controllable damper, substantially as described.

(Specification, 5s. 9d.; drawing, 1s.)

No. 21955.—24th October, 1906.—WILLIAM RUNDLE, of Stand No. 41, Worcester Gate, Marshall Street, Johannesburg, Transvaal, Blacksmith, and THOMAS EDWARD LUND, of Stand No. 689, Bezuidenhout Valley, Johannesburg aforesaid, Contractor. Improvements in nut-locks.

Claims.—(1.) In a nut-lock, or means for securing a nut on a bolt or its equivalent, in combination, a bolt or its equivalent and nut of a washer, means which operate to prevent the rotation of the washer round the bolt while permitting it to slide along the bolt, the washer being constructed with one or more projections adapted to engage the nut, substantially as described and shown. (2.) In a nut-lock or means for securing a nut on a bolt or its equivalent as claimed in the preceding claim, the provision of one or more longitudinal grooves in the bolt, and a corresponding projection or projections on the washer adapted to slidingly engage said groove or grooves, as and for the purpose set forth. (3.) A washer for a nut-lock constructed substantially as described in connection with and as shown in Figs. 1 to 3, or Fig. 4, or Figs. 5 and 6, or Figs. 7 to 11, or Fig. 12, of the drawings. (4.) A nut-lock constructed substantially as described in connection with and as illustrated in Figs. 1 to 3, or Fig. 4, or Figs. 5 and 6, or Figs. 7 to 11, or Figs. 12 and 13, of the drawings.

(Specification, 4s. 9d.; drawing, 2s.)

No. 22117.—27th November, 1906.—NEVILLE CHARLES THOMASON HARPER, of Durban, Natal, South Africa, Engineer. An improved method of manufacturing crystallized carbonate of soda (Na₂CO₃ + 10H₂O).

Extract from Specification.—Carbonate of soda (Na₂CO₃) or any other suitable alkali is placed in a circular water-tight vessel with a steam-tight jacket on the outside, as shown at Fig. C on the diagram. Water is then run into the vessel until it is full. Steam is then turned into the space between the vessel and the jacket, so as to thoroughly heat the water, and the mixture is stirred by a suitable spindle fixed inside the circular vessel until the carbonate of soda or other suitable alkali is dissolved. To such, spindle-arms are attached in such a way as to thoroughly mix the whole composition when the spindle revolves. The spindle may be driven by bevel wheels or by belt direct, as may be desired. On the liquid reaching the desired density it may be allowed to run out through a pipe or pipes or other suitable means to a settling-tank, for the purpose of depositing impurities, and then run into cooling-tanks, or it may, if desired, be run direct on to a cooler as shown at Fig. D. This cooler may be constructed of pipes wherein the liquid to be cooled runs over the outside and the cooling medium inside, or vice versa, or the liquid may be made to run through the inside and also over the outside of a hollow circular cooler, as shown at Fig. E, the cooling medium in this case being circulated between the outside and inside surfaces, or the liquid may be run over a hollow flat cooler, as shown at Fig. F, the cooling medium being circulated on the inside or underneath as may be desired, or the liquid may be run over wire mats, as shown at Fig. G, or allowed to fall from a height against a current of air, which may or may not have been previously cooled by artificial means, as shown at Fig. H, I being a tank with perforated bottom when liquid falls from a height. The liquid, after running over or through the coolers or falling over the mats, or from a height, is run into the crystallizing-tanks shown at Fig. A, which may be arranged with double bottoms and sides, or hollow divisions inside, or fitted with pipes as shown at Fig. B, or other vessels through which a cooling medium is circulated for the purpose of lowering the temperature in the crystallizing-tanks, and thus hastening the process of crystallization. For the purpose of still further hastening the process of crystallization, the tank itself may be contained in a chamber artificially cooled by any of the known processes of refrigeration.

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

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

No. 22242.—22nd December, 1906.—RICE OWEN CLARK, of Hobsonville, Auckland, New Zealand, Pipe-manufacturer. Improvements relating to partly glazed earthenware blocks suitable for general building purposes.

Extract from Specification.—This invention relates to making hollow blocks of earthenware shaped in the various forms specified, having their outer faces glazed and their inner surfaces rough-formed and grooved, so as to render them suitable and useful for building purposes, and so that facade formations may be produced as may be required. In making these blocks the two sides which stand vertical when built in are made thicker than the horizontal sides, as they have all the weight to bear. The sides of the blocks which face outwards and inwards are glazed so as to render them impervious to damp or moisture on their outsides surfaces, and artistic in appearances on their faces, while the upper and lower surfaces which have to be bedded in mortar or the like are made rough and unglazed, and preferably with groove running transversely or otherwise, so as to grip the mortar or the like and thereby prevent any possibility of the blocks moving after being laid. Where it is desired to plaster the inside of the rooms the inside faces of the blocks will not be glazed, but they will be roughened so as to provide a grip or the plaster.

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

(Specification, 8s. 3d.; drawing, 2s.)

No. 22328.—10th January, 1907.—ALEXANDER McCORKINDALE, of Island Block, Otago, New Zealand, Miner. An improved water-motor for pipe-lines.

Claims.—(1.) In a pipe-line for delivering water for other uses under pressure, and where pressure to spare is present, in combination with the pipe-line, a motor working in a branch or portion of the pipe-line where the water can be turned on or off as desired, a motor capable of being worked by the water passing down the pipe-line, all substantially as shown on the drawing, and as described and as explained. (2.) In combination with a pressure pipe-line, a screw motor with feathers or guides to bring the water to better advantage in turning the screw, and means of turning the water to pass another way, all substantially as set forth. (3.) In combination with a pressure pipe-line, a paddle motor working in a casing which is automatically filled with air to allow the upper part of said wheel to work in said air, all substantially as set forth. (4.) A motor working in a pressure pipe-line, and discharging the tail water into lower parts of same pipe-line without any loss of the water, all substantially as set forth.

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

No. 22330.—21st January, 1907.—DANIEL SMITH and FREDERICK WILLIAM SMITH, both of Christchurch, New Zealand, Boot-manufacturers. Improvements in goloshes and the like.

Claims.—(1.) In the construction of rubber footwear, and in combination with an upper, inner sole, and outer sole, a filling-piece having leather sections secured upon it, said outer sole having omitted portions corresponding to some of said sections, and holes to receive other of said sections, whereby the faces of said sections provide wearing-surfaces which minimise the wear of the surface of the rubber sole and heel, substantially as specified and illustrated. (2.) In the construction of rubber footwear, and in combination with an upper and an inner sole, a filling-piece, and a rubber sole having its integrally formed rear portion omitted to correspond with said leather section, substantially as specified and illustrated. (3.) In the construction of rubber footwear, and in combination with an upper and an inner sole, a filling-piece, a toe section secured upon the said filling-piece, and a rubber sole having a portion omitted corresponding with said leather toe section, substantially as specified and illustrated. (4.) In the construction of rubber footwear, and in combination with an upper, an inner sole, a filling-piece, an outer sole, leather wearing-sections secured upon said filling-piece, and an outer sole having omitted portions corresponding with heel and toe portions of said sections, and having holes to receive intermediate portions of said wearing-sections, substantially as specified and illustrated.

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