June 15.] THE NEW ZEALAND GAZETTE. 1493

mence at or near the base of the cone-plate, and deepening so as to become more pronounced as they ascend, substantially as set forth, and shown by Figs. 2, 3, 4, 5, and 6 upon the drawings.
(Specification, 4s.; drawings, 2s.)

No. 19426.—4th May, 1905.—HENRY JULIUS HORSTMANN, of 402, East Berry Street, Fort Wayne, Indiana, United States of America, Mechanical Engineer. Improvements in mercury-vapour amalgamators.

Extract from Specification.—In the operation of this invention the cam 27 and the sprocket wheel 28 are set in motion by the driving mechanism 29, and thereby the barrels will rotate continuously and the valves 19 and 20 will successively and alternately close and open. The wheel 16 of the feeding-device is also rotated continuously by means of its pulley 45. Heat is then applied to the barrels by building a fire in the heating-chamber 8, and, when suitably heated, vapour of mercury is supplied to said barrels by turning the valve 46 which controls the supply from the retort 44. The ore to be treated is in pulverulent form, and dry, and, if desired, may be hot when placed in the hopper 15. The ore thus supplied is carried by the rotating wheel 16 beneath the gate 17, from whence it gravitates into the chute 14, through which it passes as the valves 19 and 20 are actuated. A small vent 47 is made in the chute 14 to allow the passage of air or gas from within the hood into the chute, or vice versa. From said chute the ore enters the inner barrel, and, because of the wings 4, is more or less disseminated within said barrel, and caused to move therein towards its rear end, from whence it is discharged into the corresponding end of the outer barrel. The behaviour of the ore in the outer barrel is similar to that in the former barrel, except that its movement is in the opposite direction, and is discharged at the forward end of said outer barrel into the funnel 32, from whence it passes through the discharge-pipe 33 into the water in the tank 36. Water is suitably supplied to the cylinder 34, and a body of water is thereby maintained therein above the perforated web 35, and the water which passes through the web condenses the vapour in the cylinder 34, which enters therein with the discharged ore from the pipe 33. The ore upon entering the tank 36 is chilled by the water contained therein, and the escape of mercury-vapour is thereby prevented. During the passage of ore through the barrels as above described the mercury-vapour contained in the barrels intermingles with the ore, with the result that the amalgamable portion of the ore becomes more or less affected by the vapour, such as to render said portion readily recoverable by subsequent treatment with amalgamating-plates such as are common in the art for treating ore.
[NOTE.—The above extract from the specification is inserted in place of the claims.]
(Specification, 7s.; drawing, 5s.)

No. 19443.—10th May, 1905.—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, New York, United States of America (assignees of Frederick Ray, of East Orange, New Jersey aforesaid, Mechanical Engineer). Improvements in centrifugal, turbine, and similar pumps.

Claims.—(1.) In a centrifugal, turbine, or similar pump of that class having an enclosed impeller, the use of a pressure-equalising connection between the spaces outside the opposite side walls of the impeller. (2.) In a multi-stage centrifugal, turbine, or similar pump of that class having a plurality of enclosed impellers, the use of a pressure-equalising connection between the spaces outside the opposite side walls of each impeller. (3.) In a centrifugal, turbine, or similar pump of that class having one or more enclosed impellers taking suction on one side of the impellers and means for balancing the suction pressures, the use of a pressure-equalising connection between the spaces outside the opposite side walls of the impeller or impellers. (4.) In a centrifugal, turbine, or similar pump of that class having one or more enclosed impellers and diffusing-vanes outside the impeller or impellers, the use of a pressure-equalising connection between the opposite sides of the impeller or impellers formed through the diffusing-vanes.
(Specification, 5s.; drawing, 1s.)

No. 19444.—10th May, 1905.—HENRY R. WORTHINGTON, a corporation organized and existing under the laws of the State of New Jersey, and having their principal place of business at 114, Liberty Street, New York, United States of America (assignees of Frederick Ray, of East Orange, United States of America, Mechanical Engineer.) Improvements in multi-stage centrifugal, turbine, and similar pumps.

Claims.—(1.) In a centrifugal, turbine, or similar pump, a plurality of impellers having suction openings on opposite sides at the hub, with passages connecting the pump suction with both suction openings of the first impeller, and passages connecting the delivery of the first impeller with both suction openings of the next impeller, and so on through the series of impellers. (2.) In a centrifugal, turbine, or similar pump, the casing A, and the series of double-suction impellers E¹, E², &c., having suctions s¹, s², delivery-passages e¹, e², &c., connecting the delivery of each impeller with the suction s¹ of the next impeller, passage f¹ connecting with the pump suction, passages f², f³, &c., connecting with the delivery-passages e¹, e², &c., and suction chambers or passages g¹, g², &c., extending inward from the passages f¹, f², &c., to the suction s². (3.) A multi-stage centrifugal or turbine pump, substantially as described, and shown in the drawings.
(Specification, 4s.; drawing, 1s.)

No. 19464.—15th May, 1905.—JAMES HOLDEN, of Hermon Hill, Wanstead, Essex, England, Engineer, and EDMUND SPENSER TIDDEMAN, of 14, Elgin Road, Seven Kings, Essex, England, Engineer. Improvements in and relating to spark-arresting apparatus.

Extract from Specification.—A suitable appliance for the purpose is composed of a number of plates, of which each is inclined upwardly backwards, and each except the lowest is arranged above another, so that a spark striking any of the plates (except the lowest) will be deflected thereby downwardly and against a lower plate, which will in turn deflect it away from the fire-tubes and into a position whence it will not be carried upwards by the current. The appliance so arranged will present practically no impediment to the free flow of the gases of combustion. Furthermore, to prevent sparks from passing direct from the fire-tubes into the blast, a suitable deflecting-device—for example, one or more plates—is arranged in front of the fire-tubes above the blast-pipe and between it and the tubes.
[NOTE.—The above extract from the specification is inserted in place of the claims.]
(Specification, 9s.; drawing, 2s.)

No. 19476.—16th May, 1905.—CHARLES TREVETHICK, of the Lower Hutt, New Zealand, Brush-manufacturer. Improvements in brushes.

Claims.—(1.) The improved brush constructed and arranged substantially as described in the specification and illustrated in the drawings. (2.) In a brush, the construction of the stock by hollowing out the back of same, and the formation thereby of a raised ledge or rim around same to permit of holes being bored at the ends and sides of the stock at such angles as to allow the knots of bristles being fixed so as to project at the ends and sides of the stock, substantially as described and illustrated. (3.) A brush lightened in weight by the excavation or hollowing of the back of the stock, substantially as described and illustrated. (4.) I disclaim any of the usual elements of construction disclosed by the description or drawings.
(Specification, 2s.; drawing, 1s.)

No. 19515.—23rd May, 1905.—TOM WILSON, of Otahuhu, Auckland, School-teacher. An improved altimeter or quadrant.

Claims.—(1.) In an altimeter or quadrant, a rectangular base with the quadrant of a circle attached thereto, with a stile or gnomon slidably fitted to the arc of the quadrant, substantially as described, for the purpose above set forth, and illustrated by the drawings. (2.) In an altimeter or quadrant, the combination of a rectangular base with meridian and zero lines marked or inscribed thereon at right angles to one another, a triangular strut hinged to said base for securing quadrant, and a quadrant of a circle hinged to said base so that its front side fits on the meridian line and back end of its bottom edge fits on to the zero line, the front side of the said quadrant having a graduated scale marked or inscribed on the arc of the quadrant, with a stile or gnomon slidably fitted to said arc, substantially as described, and illustrated by the drawings.
(Specification, 3s.; drawing, 1s.)

An asterisk (*) denotes the complete specification of an invention for which a provisional specification has been already lodged.
NOTE.—The cost of copying the specification and drawing has been inserted after the notice of each application. An order for a copy or copies should be accompanied by a post-office order or postal note for the cost of copying.
The date of acceptance of each application is given after the number.
Extracts from the drawings accompanying the foregoing complete specifications appear at the end of this Gazette.
F. WALDEGRAVE,
Registrar.