Feb. 21.] THE NEW ZEALAND GAZETTE. 513

Claims.—(1.) A screw propeller provided with blades constructed with a reduced pitch towards their tips, as set forth. (2.) A screw propeller fitted with vanes behind the blades, as set forth.
(Specification, 5s. 3d.; drawings, 2s.)

No. 13357.—30th January, 1901.—HENRY CORRICK, of 47. Roseneath, Wellington, New Zealand, Boot-manufacturer, An improvement in chrome-dressed leather.

Claim.—The blacking and finishing the flesh side of chrome-dressed leather, or removing the grain and blacking the remaining surface, instead of blacking and finishing the grain side, as is at present the custom.
(Specification, 1s.)

No. 13361.—31st January, 1901.—WILLIAM SPENCER, of Lothersdale, near Keighley, York, England, Gentleman. Improvements in kilns for burning or calcining limestone or like substances.

Claims.—(1.) In a kiln of the kind described, a cavity or cavities in the wall of the kiln connected by means of a number of ascending passages with a smaller number of passages leading into the interior of the kiln near where the fuel is fed in, substantially as and for the purposes described. (2.) In a kiln of the kind described, having two or more chambers with constricted intervening passages, a cavity or cavities in the wall of the kiln connected by means of a number of ascending passages with a smaller number of passages leading into the interior of the kiln at or near the constricted intervening passage or passages, substantially as and for the purposes described. (3.) The improved kiln for burning limestone or the like constructed, arranged, and operating substantially as described. (4.) In kilns of the class described, the application of means whereby all the outer walls of said kilns are rendered of an airtight construction, as and for the purpose specified.
(Specification, 4s. 3d.; drawings, 2s.)

No. 13365.—28th January, 1901.—HARRY NOEL BURGESS, of Parnell, near Auckland, New Zealand, Picture-framer. An improved cooking-stove for use as an addition to Primus and similar kinds of stoves or lamps.

Claims.—(1.) In an improved stove of the kind described, the flue for holding the heat immediately over and to one side of the oven, and the holes at the lower end of flue for letting the heat from the flue into the oven, for the purpose set forth, substantially as described and illustrated. (2.) In an improved stove of the kind described, the upper shelf, and holes therein for holding kettles, pots, and pans in position for the purpose set forth, substantially as described and illustrated. (3.) In an improved stove of the kind described, the lower shelf, with hole therein for fitting the lamp into, and the band beneath for securely holding the lamp in position, for the purpose set forth, substantially as described and illustrated. (4.) In an improved stove of the kind described, in combination, the different parts of the improved stove above described, and as illustrated, all for the purpose set forth.
(Specification, 2s. 3d.; drawings, 1s.)

No. 13375.—7th February, 1901.—PIERRE FINCH MARTINEAU BURROWS, of Hunter ville, Wellington, New Zealand, Architect. A combined letter-weigher and a pen or pencil.

Claim.—The combination of an appliance for weighing letters and a tube or tubes for holding or containing a pen or a pencil, substantially as described.
(Specification, 2s.; drawings, 1s.)

No. 13377.—7th February, 1901.—WALTER MCDERMOTT, of 43, Threadneedle Street, London, England, Mining Engineer (assignee of Francis Edward Elmore, of 4, Bishopgate Street, London aforesaid, Electro-metallurgist). Improvements in ore-concentrating machines.

Claims.—(1.) In a concentrator of the class described, the combination of two shaking travelling-belts with a common shaft, substantially as and for the purpose described. (2.) In a concentrator of the class described, the arrangement of a common crank-shaft driving two shaking-frames supporting the travelling belts, and held together or held apart (or held independently) by springs or equivalent devices so that the cranks or eccentrics communicate their motion by constant thrust or constant draw as the case may be, substantially as and for the purpose described. (3.) In a concentrator of the class described, the arrangement of a common crank-shaft with two cone pulleys connected by gearing or the like, with separate driving-rollers or shaking-frames, so that the two belts on said frames may be independently regulated with reference to a fixed speed of the crank-shaft, substantially as and for the purpose described. (4.) In a concentrator of the class described, and in combination, transverse foundation-beams, centrally arranged pedestals on same for supporting a crank-shaft, two shaking-frames, and supporting-toggles for same, substantially as and for the purpose described. (5.) In a concentrator of the class described, the combination of a single crank shaft with two independent shaking-frames, supported on toggles adjustable by movable bearings so as to permit of independent levelling of the frames transversely, and of independent alteration of inclination of the frames longitudinally, substantially as described. (6.) In a concentrator of the class described, the method of driving the shaking-frame supporting a travelling flanged belt by a crank or eccentric shaft supplemented by springs or equivalent devices so as to secure the absence of jar or percussive motion in the rotary movement of the shaft, substantially as and for the purpose described.
(Specification, 7s.; drawings, 2s.)

No. 13378.—7th February, 1901.—ISAAC SHIMWELL MCDOUGALL and ISAAC MCDOUGALL, both of 68, Port Street, Manchester, England, Manufacturing Chemists. Improvements in and relating to sheep-dipping preparations.

Claims.—(1.) Preparing sheep-dip in the form of solid blocks or cakes, adapted to be readily handled, and transported in inexpensive wrappings or packages, and composed of the ordinary disinfectants, insecticides, or ingredients, with a sufficient proportion of a firmly setting or solidifying material, substantially as described. (2.) Sheep-dip in the form of solid blocks or cakes composed of the ordinary disinfectants, insecticides, or ingredients, with a sufficient proportion of a firmly setting or solidifying material, and such that it may be transported and stored without the use of the usual metal or wooden containers. (3.) Sheep-dip in the form of solid blocks or cakes, provided with indentations, corrugations, or perforations, to enable it to dissolve readily, and to be easily broken into suitable smaller pieces, substantially as described.
(Specification, 3s.)

No. 13379.—7th February, 1901.—Dr. HERMANN PASSOW, of 11, Posthof, Hamburg, German Empire, Manager. Process for the production of cement.

Claims.—(1.) Process for production of cement, consisting in melting down the raw materials together to a liquid mass, and treating the latter while liquid with oxygen, air, or oxygen-containing gases. (2.) Process for production of cement, consisting in treating blast-furnace slag, while liquid, with oxygen, air, or oxygen-containing gases.
(Specification, 3s. 6d.)

No. 13380.—7th February, 1901.—OTTO SIEBOLD, of Neubrandenburg, Mecklenburg, German Empire, Chemist. An improved process for the production of alkali compounds of aluminous substances.

Claims.—(1.) An improved process for the production of soluble neutral alumens salts from aluminous bodies reacting as acids, in which process the precipitated and still moist aluminous matter is treated with a bicarbonate or acid carbonate until a glassy, swollen, lumpy, or flocks, tough consistency results, the so-obtained product being subsequently dried, substantially as described. (2.) An improved process for the production of soluble neutral alumens-salts from aluminous bodies reacting as acids, in which process the precipitated and still moist alumens is treated with bicarbonate or acid carbonate, said treatment being accelerated by heat, until a glassy, swollen, lumpy, flocks, tough consistency results, the so-obtained product being subsequently dried, substantially as described. (3.) An improved process for the production of soluble neutral alumens-salts from aluminous bodies reacting as acids, in which process any of the described operations or steps may be carried out in an atmosphere containing carbonic acid, substantially as described.
(Specification, 6s. 9d.)

No. 13382.—7th February, 1901.—CROWN GOLD-MILLING COMPANY, a corporation organized under the laws of the State of California, and having its principal place of business at 23, Stevenson Street, San Francisco, United States of America (assignee of Frederick Ward Wood, of 23, Stevenson Street, San Francisco aforesaid, Mechanic). Dry concentrators.