1526
THE NEW ZEALAND GAZETTE.
[No. 49

ter of the concentrating-surface, the lateral or transverse inclination of the table, the character of the reciprocating movement of the table, and the manner of feeding the pulp and dressing-water to the table. The several objects, therefore, of our present invention are, first, to facilitate the stratification of the pulp-constituents according to their specific gravities, and to cause the rapid settling of the finer values at the feed end of the table, as well as to relieve the table of a greater part of the load of dressing-water at that point; and to accomplish this we cause the concentrating-channels to deepen and widen from the heel of the table towards the toe of the table, preferably for a distance equal to, if not greater than, the extent of the feed of the pulp thereon, and such a construction embodies one feature of our invention. A second object of our invention is to cause the gradual approach of the concentrates or values to the plane of the table in their movement towards the toe of the table, so that the channels are kept filled and present a plane surface for the separation of the gangue by the action of the dressing-water; and to accomplish this we cause the concentrating-channels to shallow and narrow from a point corresponding substantially with the zone of pulp-feed towards the toe or front end of the table, and such a construction embodies another feature of our invention. A further object we have in view is to increase the capacity of the table by reducing the amount of “middlings,” or admixture of coarser particles of gangue, lighter particles of mineral, &c., which come over the forward end of the table at the lower corner thereof; and this we accomplish by deflecting or breaking up the flow of dressing-water by a series of baffle-buttons arranged between the channels at the lower forward end of the table, and preferably on diagonal lines corresponding with the zone of the “middlings,” whereby the lighter minerals will be deposited in the channels and the coarser gangue deflected towards the tailings side of the table, and such a construction embodies a further feature of our invention. There are other features of our invention involving the relative depth, length, and arrangement of the channels of the concentrating-surface, and the construction and arrangement of the mechanism for adjusting the lateral inclination of the table, all as will be more fully pointed out, and finally summed up in the claims.

[NOTE.—The above extract from the specification is inserted in place of the claims.]
(Specification, 18s.; drawings, 5s.)

No. 17898.—11th May, 1904.—N. GUTHRIDGE, LIMITED, of 486, Collins Street, Melbourne, Victoria, Australia, Merchants (assignees of William Legrand Card and Frank Smith Card, both of Denver, Colorado, United States of America, Mechanical Engineers). Improvements in mechanical movements particularly applicable for actuating shaking-table ore-concentrators.

Extract from Specification.—Our invention relates generally to a mechanical movement for producing a variable reciprocating motion, but has been especially devised as a means for actuating concentrator-tables where accurate adjustment of the acceleration and length of the stroke of the forward and rearward travel of the table is desired. To this end the main feature of our invention, generally stated, embraces the combination in a mechanical movement of a revolving crank and an oscillating crank adapted to have a quadrant travel-arc, with intermediate pitman connection for imparting the desired character or acceleration to the stroke, and in combination therewith a vibrating adjustable member for regulating the length of the stroke, whereby the length of the stroke may be varied without affecting the character of the same. A secondary feature of our invention embraces in a mechanical movement of the character indicated, the combination, with a revolving crank and an oscillating crank adapted to have a quadrant travel-arc, of an intermediate adjustable pitman, and a vibratory member whereby the character of the stroke may be varied without varying the length of the stroke.

[NOTE.—The above extract from the specification is inserted in place of the claims.]
(Specification, 11s.; drawings, 6s.)

No. 17902.—9th May, 1904.—WILLIAM SASSE, of Cardrona, New Zealand, Dredgeman. Improvements in conveying water under pressure on to a gold-dredge for motive purposes.

Claims.—(1.) In dredging with water under pressure conveyed to a floating dredge, the combination of pipes provided with universal, swivel, or pivot joints, with rods or ropes suspending same from any convenient part of a dredge, or from trestles placed where needed where such parts of a dredge are not convenient for the suspension of the pipes. (2.) In dredging with high-pressure water conveyed from the shore to a floating dredge as motive power for dredging, the combination of pipes arranged to bend at their ends by joints, with means of suspending said pipes while still allowing them to move at their joints, all substantially as set forth and as described and explained.
(Specification, 2s.; drawing, 1s.)

No. 17905.—9th May, 1904.—HERBERT SPENCER STARK, of Johannesburg, Transvaal, Mining Engineer. A new process for the extraction of gold from pyritic auriferous ores, particularly applicable to the recovery of gold from the residues resulting from the treatment of such ores by ordinary cyanide-solutions.

Extract from Specification.—My method consists, briefly, in treating the previously crushed ore with a solution of sulphocyanide of an alkali metal in the presence of an oxidizing agent. This latter, assisted by the inherent acidity of the ore, brings about a slow decomposition of a portion of the sulphocyanide, resulting in the production, in close proximity to the gold-particles, of nascent cyanogen and hydrocyanic acid. Both of these substances are, as is well known, powerful gold-solvents, and thus, upon their formation, dissolve out any adjacent metallic gold, which is thereupon carried into the sulphocyanide-solution. This solution is subsequently leached out of the ore and its contained gold separated from it by any suitable means.

[NOTE.—The above extract from the specification is inserted in place of the claims.]
(Specification, 7s.)

No. 17907.—14th May, 1904.—SCOTT SYMINGTON, of 55, Salisbury Street, Christchurch, Canterbury, New Zealand, Draughtsman. Improvements in trolley-wheels of electric cars.

Claims.—(1.) For the purpose indicated, a wheel having a hollow interior for containing a lubricant, as set forth. (2.) In apparatus for the purpose indicated, in combination, a wheel having a hollow interior for containing a lubricant, a bush fixed in the centre of the wheel and having a hole fitting the axle of the wheel, the bush being apertured to allow the lubricant to flow from the interior of the wheel to the axle, as set forth. (3.) For the purpose indicated, a wheel having a hollow interior for containing a lubricant and radial ribs in the interior of the wheel, as set forth. (4.) For the purpose indicated, a wheel having a hollow interior for containing a lubricant, radial ribs in the interior of the wheel, a bush fixed in the centre of the wheel and having a hole fitting the axle of the wheel, the bush being apertured to allow the lubricant to flow from the interior of the wheel to the axle, as set forth. (5.) The combination and arrangement of parts comprising the improvements in trolley-wheels of electric cars, substantially as and for the purposes set forth, and illustrated on the drawing.
(Specification, 1s. 6d.; drawing, 1s.)

No. 17918.—12th May, 1904.—JOHN SHORTE LARKE, of the Exchange, Bridge Street, Sydney, New South Wales, Australia, Government Representative. A clip or holder for books or blocks of leaves, and for attaching these to removable covers.

Claims.—(1.) A clip or holder for books or blocks of leaves, and for attaching these to removable covers, consisting of two gripping strips or leaves having a spring hinge at their junction or bend and a spring catch at their free ends, substantially as described and explained. (2.) In clips or holders of the class set forth, the combination, with two gripping-leaves such as 8 and 9 joined by or having a spring such as 10 at one end and a spring catch such as 11 at the other end, of flanges 14, 15, and 16, substantially as described and explained, and as illustrated in the drawing. (3.) In clips or holders of the class set forth, the combination, with two gripping-leaves such as 8 and 9 joined by or having a spring such as 10 at one end and a spring catch such as 11 at the other end, of serrations or teeth such as 17 on one or other of said leaves, substantially as described and explained. (4.) An improved clip or holder for books or blocks of leaves, and for attaching these to removable covers, constructed substantially as described and explained, and as illustrated in the drawing.
(Specification, 3s. 3d.; drawing, 1s.)