July 24.] THE NEW ZEALAND GAZETTE. 1597

Claims.—(1.) The process of recovering gold as amalgam from pulverised sulphides (commonly called “concentrates”) which consists in subjecting such sulphides when dry to the action of heat and of hot mercury-vapour, as shown in the specification, and then collecting the freed gold, whether in particles of amalgam or not, by any effective liquid-mercury amalgamating or mercury-massing apparatus. (2.) The process of recovering gold as amalgam from pulverised sulphides (commonly called “concentrates”) which consists in subjecting such sulphides when dry to the action of heat and to the action of hot mercury-vapour while their resultant temperature is between 350° Fahr. and the boiling-point of mercury, and then collecting the thereby freed gold and amalgam therein contained by means of apparatus suitable for massing finely divided mercury and amalgam or for liquid-mercury amalgamation. (3.) The process of recovering gold as amalgam from pulverised refractory ores which consists in first collecting the free gold therein contained by liquid-mercury amalgamation, and then subjecting, when dry, that part of the residue of such ore containing gold, after separating therefrom as much of the barren ore-gangue as practicable, to the action of heat and to the action of hot mercury-vapour while the resultant temperature thereof is between 350° Fahr. and the boiling-point of mercury, and then collecting the thereby freed gold and amalgam therein contained by any apparatus suitable for liquid-mercury amalgamation or for the massing of fine particles of mercury and amalgam.
(Specification, 18s. 6d.; drawings 2s.)

No. 15094.—10th July, 1902.—THOMAS HAMMILL HICKS, of 218, Brackenridge Street, Fort Wayne, Indiana, United States of America, Physician. Improvements in apparatus for separating mercury from amalgam.

Claims.—(1.) In a rotatable vessel, a cylindrical chamber and an annular chamber, each adapted to contain mercury, and both arranged concentrically to the axis of said vessel’s revolution, and connected only by one or more joints so closely fitted as to prevent the passage of mercury there-through except under pressure. (2.) A rotatable vessel having two concentric chambers connected only by one or more joints so closely fitted as to prevent the passage of mercury except under pressure, and an annular dam at the top of each chamber extending from its outer wall inward. (3.) In a rotatable vessel, two concentric chambers 10 and 11 connected only by one or more joints so closely fitted as to prevent the passage of mercury except under pressure, in combination with openings 12 for escape of water.
(Specification, 5s. 6d.; drawings, 1s.)

No. 15095.—10th July, 1902.—THOMAS HAMMILL HICKS, of 218, Brackenridge Street, Fort Wayne, Indiana, United States of America, Physician. Improvements in ore-concentrators.

Claims.—(1.) In an ore-concentrator, a spirally descending annular concentrating-trough adapted to rotatively oscillate, a series of riffles arranged downward and inward on the bottom, and means to oscillate said trough rotatively. (2.) In an ore-concentrator, a spirally descending annular concentrating-trough having a series of riffles arranged upon its bottom which converge downward from the outer wall toward the inner wall thereof, a series of diverting septa arranged upon the tops of said riffles downward and outward from said inner wall, and means to rotatively oscillate said trough. (3.) In an ore-concentrator, a spirally descending concentrating-trough, a free passage-way for concentrates along the inner wall of said trough, a series of riffles arranged upon the bottom of the trough converging from the outer wall toward said passage-way, and means to rotatively oscillate said trough. (4.) In an ore-concentrator, the spirally descending trough 1, the riffles 2 arranged downward and inward on the bottom of such trough, the septa 3 arranged downward and outward upon said riffles, the passage-ways 23 and 24 arranged respectively next the inner and outer walls of said trough, and means to rotatively oscillate said trough. (5.) In an ore-concentrator, the spirally descending trough 1, the riffles 2 arranged downward and inward on the bottom of such trough, the passage-way 23, the mercury-collecting trap 4 arranged in the passage-way 23, and means to rotatively oscillate the same. (6.) In an ore-concentrator, two spirally descending troughs rigidly mounted upon a hollow cylinder one above the other, and each provided with a series of riffles on the bottom converging downward and inward from the outer wall, and a series of septa on said riffles diverging downward and outward from the inner wall, and means to rotatively oscillate the same. (7.) In an ore-concentrator, riffles 2 arranged as a series annularly round a cylindrical form and individually so as to be convergent inwardly and diagonal to the intercepted radii of such form, in combination with means to differentially oscillate such concentrator about such form.
(Specification, 8s. 6d.; drawings, 2s.)

No. 15096.—10th July, 1902.—THOMAS HAMMILL HICKS, of 218, Brackenridge Street, Fort Wayne, Indiana, United States of America, Physician. Improvements in rotatable single-ball ore-pulverising apparatus.

Claims.—(1.) In ore-pulverising apparatus, a single pulverising sphere or ball 4, a ring 1 whose inner surface is concaved for most of its length to conform to the surface of said sphere and whose inner diameter is barely sufficient to admit the passage of 4 therethrough, two heads 2 and 3 fitted to engage opposite ends of 1 and support it so that its tread 26 shall be constantly equidistant at all similar points from the axis of revolution, and bolts 17 outside of 1 fitted to clamp and hold said flanges tightly against the ends of 1. (2.) In ore-pulverising apparatus, a ring having a tread on its inner surface conforming to the pulverising-sphere to roll thereon, and two heads arranged to hold and support said ring equidistant at all similar points from the axis of revolution, each having a centrally projecting trunnion containing a central opening, of which the one serves as an inlet and the other as an outlet for ore and water, the inlet-opening tapering outwardly and receiving a feed pipe which enters through a stuffing-box. (3.) In ore-pulverising apparatus, a ring having a concave tread upon its inner surface, arranged between heads having shouldered flanges and centrally projecting trunnions mounted in supporting bearings, and a solitary sphere adapted to roll upon said tread, the concavity of the tread conforming with the said sphere. (4.) In ore-pulverising apparatus, a ring having a concave tread upon its inner surface, arranged between heads having centrally projecting trunnions mounted in supporting bearings, and a solitary sphere of a size to conform to the opening of said ring.
(Specification, 3s. 6d.; drawings, 1s.)

No. 15100.—10th July, 1902.—GEORGE LEWIS GOWLLAND, of Peterborough, Ontario, Canada, Inventor. Improvements in combined prepayment and recording current-meters.

Claims.—(1.) A current-meter in which a magnetic flux is employed for giving movement to the indicating-parts, characterized by the arrangement that means are provided (such as the flux-plate 21 extending laterally from the magnet 17 and adjacent to a revolvable disc 16) whereby the flux is transferred to a distance from the magnet. (2.) In a current-meter such as defined in claim 1, the improvement characterized by the provision of means for producing eddy currents for driving a revolvable member of the indicating-mechanism. (3.) A current-meter, such as defined in claim 1, characterized by the arrangement that the meter and its indicating-mechanism (such as is shown in the upper portion of Fig. 6) are governed by a coin-controlled disc 74 in such a manner that upon the release of the said disc 74 by a coin the meter and its indicating-mechanism will function to a predetermined extent and then be positively arrested. (4.) A current-meter characterized by the arrangement that the indicating-parts (such as are shown in the upper portion of Fig. 6) are propelled by an electric current, whereof the circuit is closed by the weight of a coin depressing an electrode 65 into a vessel 67 containing mercury. (5.) A current-meter in which a magnetic flux is employed for giving movement to the indicating-parts, characterized by the arrangement that a solenoid 28 is disposed immediately opposite a certain advantageous point G upon a flux-plate 21, whereby a disc 16 rotates between the point G and the plate 21 through a double field of flux-lines. (6.) A current-meter in which a magnetic flux is employed for giving movement to the indicating-parts, characterized by the arrangement that a flux-plate 32 is adjustable relatively to the solenoid 28 and to the revolvable disc 16, which arrangement diminishes or increases the flux as per the adjustment. (7.) A current-meter in which a coin is employed for functioning the indicating-parts, characterized by the arrangement that the pointer 76 indicates any unexpended quantity of current due the consumer for a coin already deposited. (8.) A current-meter in which a coin is employed for functioning the indicating-parts, characterized by the arrangement that the disc 74 must make exactly the same number of revolutions as the number of coins deposited. (9.) A current-meter in which a coin is employed for functioning the indicating-parts, characterized by the arrangement that immediately after a coin is deposited means such as the rod 60 are provided whereby a second coin is prevented from being deposited before the meter finishes functioning for the coin first deposited. (10.) A current-meter in which a magnetic flux is employed for giving movement to the indicating-parts, characterized by the arrangement that the flux-plate 21 consists of thin laminae 23 of conducting material insulated from each other. (11.) A current-meter in which a magnetic flux is employed for giving movement to the indicating-parts, characterized by the arrangement that the magnet 45 has a divided core of magnetic material, whereby the flux is divided into two parts, one for making the disc 16 sensitive, and the other to rotate the disc. (12.) A current-