July 10.] THE NEW ZEALAND GAZETTE. 1501

Claims.—(1.) Improvements in the treatment of copper-ores consisting of, in the case of sulphide ore, first roasting to an oxide, then saturating the same with a solution of ferrous sulphate or sulphate and chloride, followed by a second roast, during which it is necessary to add a small percentage of iron-sulphide or sulphur-oxide, according to the percentage of copper present, and the subsequent dumping of the hot ore into a leaching-vat containing water, all prior to precipitation. (2.) Improvements in the treatment of copper-ores in which the copper is in the form of oxides or carbonates, consisting of converting the copper into a soluble form so that the same may be leached out with hot water in the manner substantially as described.
(Specification, 2s. 3d.)

No. 15016.—19th June, 1902.—CHARLES PETERSON, of 55, Grafton Street, Dublin, Ireland, Manufacturer. Improvements in tobacco-pipes and cigar and cigarette holders.

Claims.—(1.) A tobacco-pipe consisting, in combination, of bowl A having a stem B formed with a cavity C, a channel D connecting said bowl and cavity, the open end of said cavity C being outwardly tapered to receive a correspondingly tapered part F of a mouthpiece E, said part F being of such a length as to project a sufficient distance outside of the cavity C to allow for wear, the mouthpiece being formed with a stop or equivalent to prevent the part F when the parts are much worn being pushed into the cavity so as to close the passage D, said mouthpiece being formed with a “lip” K having a groove L, and having its bore pointing towards or directing the smoke into the space between the tongue and the roof of the mouth of the person smoking, all combined for the purposes and substantially as set forth. (2.) In a tobacco-pipe, a mouthpiece having a “lip” formed with a stop N at its upper part, a bore running in an upward direction, a groove L, and having its lower stop M completely or nearly cut away, substantially as set forth. (3.) A tobacco-pipe, cigar-holder, or cigarette-holder constructed substantially as set forth.
(Specification, 2s. 6d.; drawings, 1s.)

No. 15038.—27th June, 1902.—JOHAN ALFRED DAHLQVIST, Engineer, and CARL LUDWIG HOLM, Fitter, both of 63, Mastersamuelsgatan, Stockholm, Sweden. Improvements relating to the separation of fatty substances from emulsions.

Claims.—(1.) Method of increasing the effect in the separation of fatty substances from emulsions by centrifugal operation, consisting in, by means of guiding-strips or partitions mounted in the path of the fluid through the centrifugal apparatus, obstructing or retarding heavy particles during the passage to their outlet either by imparting to the said particles an angular velocity greater than that of the drum or by bringing the same in contact with surfaces leading to the centre, while at the same time and in the vicinity the movement of light particles toward the centre is facilitated, substantially as described. (2.) For carrying out the method claimed in claim 1, the arrangement of a hollow cone 1 mounted in the centrifugal drum for causing the fluid to flow in two axial currents of opposite direction and at different distances from the centre, provided with internal as well as external guiding-strips 2, 3 slanting to the axis or being screw-formed and inclining towards the sides of the cone and if necessary towards the wall of the drum and causing the fluid in the drum to run with an angular velocity greater than that of the drum, substantially as described. (3.) A modification of the arrangement claimed in claim 2 characterized by the fact that passages for the fluid are formed between the inner edges of the guiding-strips 3 and the outside of the cone, substantially as described. (4.) A form of the arrangement claimed in claim 2 characterized by the fact that the guiding-strips on the outside of the cone have the shape of conical rings 3 (Fig. 5) and are so mounted in relation to the fluid-current ascending from the bottom edge of the cone 1 as to retard the current of heavy particles and assist the current of the lighter particles, substantially as described.
(Specification, 5s.; drawings, 3s.)

No. 15039.—27th June, 1902.—PAUL HOPPE, of 9-12, Gartenstrasse, Berlin, Germany, Manufacturer. Improvement in arrangement for closing and opening bulkhead-doors.

Claims.—(1.) In the described arrangement for closing and opening several bulkhead-doors from a common controlling-station, the combination with means for switching the pressure stored in the accumulator on to either of a pair of pipes leading from the controlling-station to the opening-cylinders and simultaneously connecting the other to an exhaust-pipe, such means being located at the controlling-station, of means for connecting the one end of said cylinders either with one of the said pair of pipes or with the said exhaust-pipe and for simultaneously connecting the other end of said cylinders with either of the said pair of pipes. (2.) In the described arrangement for closing and opening several bulkhead-doors from a common controlling-station which consists of a pressure-accumulator, an hydraulic cylinder fitted to each of said doors, and means for operating said doors when pressure is admitted to either end of said cylinders, the combination with a four-way valve located at the controlling-station of a pipe connecting said central valve to said accumulator, a second pipe connecting said central valve to each of the cylinders and leading to an exhaust-tank, and of two more pipes connecting the central valve with the cylinders, the central valve being arranged so as to connect either of the two latter pipes to the pressure-pipe and the other to the exhaust-pipe or vice versa, and of means for connecting one end of said cylinders with either of the said latter pipes and the other end with either the one of said latter pipes or with the exhaust-pipe. (3.) In the described arrangement for closing and opening several bulkhead-doors from a common controlling-station, the combination with hydraulic cylinders fitted to each of said doors, means for closing and opening said doors when pressure is admitted to either end of said cylinders, a pair of three-way cocks fitted to each of said cylinders, each of which cocks is connected by a pipe or channel to one end of the cylinder, means for simultaneously operating both three-way cocks, such three-way cocks being arranged and connected so as to switch the one end of said cylinders on to either of a pair of pipes connecting all cylinders with the controlling-station and the opposite end of the cylinders either on to one of said pair of pipes or on to an exhaust-pipe likewise connecting all doors with the controlling-station, of a pressure-accumulator, a pipe connecting same with the controlling-station, and of a four-way cock fitted at the controlling-station and adapted and connected so as to switch the pressure stored in said accumulator on to either of the above said pair of pipes and simultaneously to connect the other to the exhaust-pipe. (4.) In an arrangement for centrally controlling the opening and closing of several bulkhead-doors such as described, the arrangement of three pipes or mains connecting the controlling-station with all the doors and which pipes are connected in such a way that one of them always acts as an exhaust-pipe whilst the two others act either as exhaust or pressure pipe. (5.) In an arrangement for closing and opening bulkhead-doors, an hydraulic cylinder operatively connected to each door, and a pair of hand-controlled three-way cocks connected to each end of said cylinder and positively coupled and connected in such a way that in one position one end of the cylinder is placed under pressure and the other exhausted and vice versa.
(Specification, 7s.; drawings, 1s.)

No. 15040.—27th June, 1902.—WILLIAM WATTIE, of Worcester, Massachusetts, United States of America, Mechanical Engineer. Improvements in straw matting and looms for making the same.

Claims.—(1.) In a mechanism for making a selvage edge on straw matting, &c., consisting of a needle for holding the turnover thread, which thread engages and turns in the projecting small end of the filling-straw, means for guiding said thread, and means for guiding the selvage cord and a supplemental binder-thread adjoining said cord, and means for operating said needle to move it downwardly, inwardly and upwardly, and downwardly, outwardly, and upwardly, substantially as shown and described. (2.) In a mechanism for making a selvage edge on straw matting, &c., a needle which holds the turnover thread, which thread engages and turns in the projecting small end of the filling-straw, a guide through which said thread extends, a guide for the selvage cord, and a supplemental binder-thread adjoining said cord, and means for operating the needle to carry the turnover thread downwardly, inwardly, and upwardly and hold in the small end of the filling-straw and bring it upon the under-surface of the matting, substantially as shown and described. (3.) In mechanism for making a selvage edge on straw matting, &c., a needle for holding the turnover thread, which thread engages and turns in the projecting small end of the filling-straw, a guide for said thread, a guide for the selvage cord and for the supplemental binder-thread adjoining said cord, and means for communicating a vertical and an oscillating motion to said needle, substantially as shown and described. (4.) In mechanism for making a selvage edge on straw matting, &c., a needle for holding the turnover thread, which thread engages and turns in the projecting small end of the filling-straw, a guide for said thread, a guide for the selvage cord and for a supplemental binder-thread adjoining said cord, and means for communicating a vertical and an oscillating motion to said needle, said means consisting of a cam and intermediate connections to said needle for communicating a