Feb. 23.] THE NEW ZEALAND GAZETTE. 607

No. 17958.—26th May, 1904.—ENOCH RICHARDSON, of 9, Creswick Street, Hawthorn, Victoria, Australia, Engineer. A new self-controlled regulating and release exhaust-valve for steam and other motive engines.*

Claims.—(1.) In a self-controlled release exhaust-valve, the piston-valve G, in combination with the rod H and sleeve J, the said rod working through the piston-valve E¹ and controlled by a single eccentric, substantially as set forth and described, and illustrated by the drawings. (2.) In a self-controlled release exhaust-valve, a cylindrical valve-chest D with steel lining Q, provided with circular exhaust-ports R and steam-ports P, over which the three piston-valves E, E¹, and G work, substantially as set forth and described, and illustrated by the drawings. (3.) In a self-controlled release exhaust-valve, the combination of parts whereby the pistons of steam and other motive engines are relieved from back pressure by the controlling action of a piston-valve such as G, substantially as set forth and described, and illustrated by the drawings.
(Specification, 4s. 3d.; drawings, 2s.)

No. 17975.—31st May, 1904.—GEORGE HENRY WALLACE, of Brunswick Street, New Farm, Queensland, Australia, Electrician, and WILLIAM HENRY LOWTHER, of Nobel Estate, Clayfield, Queensland aforesaid, Mechanician. Improvement in totalisators.

Claims.—(1.) Improvement in totalisators, comprising, in combination, an oscillatory moving shaft or spindle, said shaft or spindle having fixed thereon an arm, said arm being connected to a perpendicular rod with a double-shouldered screw or forked joint, said rod being connected by another arm to a segment which works in a small-toothed pinion, and which is keyed on to another shaft, said shaft having loose registration wheels thereon, which said wheels are brought into action by a pall or ratchet, said ratchet being fixed to brass disc which is keyed to shaft of registration wheels. (2.) Improvement in totalisators, comprising, in combination, a system for registering on the totalisator the sale of tickets at the various exchanges distributed about the racecourse by the use of an electro-magnet, which cuts out at the totalisator number of marbles equivalent to tickets sold at said exchanges. When a race is run we communicate from the totalisator with the operators in the exchanges by telephone, notifying them of the amount of the dividend to be paid, said telephone also being used for general purposes.
(Specification, 3s.; drawings, 6s.)

No. 18538.—4th October, 1904.—DONALD CLARK, of Bairnsdale, Victoria, Australia, Metallurgist. An improved process for the separation of gold from silver and other metals obtained by precipitation on zinc or other metals or substances.*

Claims.—(1.) The process described of separating gold from silver and other metals and metallic substances with which it is commonly associated in slimes or in precipitates on zinc or other metals or substances which consists—first, in subjecting the slimes or precipitates where necessary or desirable to the action of dilute hydrochloric acid until calcium carbonate or hydroxide or such salts are dissolved, and removing the same by a water wash; second, where necessary or desirable subjecting the slimes or precipitates to the action of dilute sulphuric acid until the coarse particles, if any, of zinc and such metals as are easily attacked are dissolved, and in removing the clear liquid containing the sulphates, but not necessarily washing them all out; third, the drying the slimes or precipitates, with the addition of sulphuric acid and a soluble sulphate or an equivalent, and heating the caked product; fourth, in the application to the caked product of a pyrosulphate of the alkalies or of nitre-cake, or the equivalent of them, or one of them, and heating until the base metals and silver are transformed to sulphates; fifth, in subjecting the fused mass to a water wash to remove sodium-salts and the silver if in small proportions, or the silver sulphate has been decomposed by the heat; sixth, in removing silver sulphate, if present in large quantities, by means of sulphuric acid; eighth, in the removal and collection of gold from insoluble material by smelting or by means of mercury and cyanide of potassium. (2.) In the process described, subjecting the slimes or precipitates containing gold, silver, and other metals or metallic substances to the action of a pyrosulphate of the alkalies or nitre-cake, or the equivalent of them, or one of them, and heating the same so as to form sulphates of the base metals and silver, which sulphates are afterwards washed out, the silver being easily recovered therefrom and the gold remaining insoluble, substantially as described. (3.) In the process described, either with or without preliminary treatment subjecting such slimes or precipitates to the action of sulphuric acid and a soluble sulphate or an equivalent, and heating the product so as to cake the same, and afterwards subjecting the product to the action of a pyrosulphate of the alkalies or nitre-cake, or the equivalent of them, or one of them, and heating the same so as to form sulphates of the base metals and silver, which sulphates are afterwards washed out, the silver then easily recoverable therefrom and the gold remaining insoluble and easily recoverable, substantially as described.
(Specification, 7s.)

No. 18648.—27th October, 1903.—JOHN JULIA RIDGWAY, of Rosebank, Staten Island, New York, United States of America, Mechanical Engineer. Improvements in belt conveyors.

[NOTE.—This is an application under section 106 of the Act, the date given being the official date of the application in the United States of America.]

[NOTE.—This application is regazetted as applicant is applying for prior date under section 106.]

Extract from Specifications.—This invention relates to improvements in belt conveyors of the type that consist in endless belts mounted on rollers and caused to travel by the rotation of the rollers in order to carry articles or materials fed on to them from one place to another. The improvements consist in the provision of means whereby the conveyor belt may be caused to assume a curved or trough form in cross section while travelling along the distance through which the article or materials have to be conveyed. Such means consist broadly in the employment of a duplicate endless belt mounted between the main conveyor belt so as to travel along in parallel lines thereto. To the outer face of this second belt are attached, at regular intervals apart, transverse battens or members that are curved downwards and inwards from both ends towards their middle. When the belts are drawn taut these battens will press against the underface of the outer or main conveyor belt so as to cause it to assume the same trough-like form as the battens. Special means are provided whereby both of the belts may be caused to travel simultaneously at the same speed, may be regulated in tension independently of each other, and whereby the outer belt may have its edges turned upwards before it comes under the influence of the trough-shaped members.
[NOTE.—The above extract from the specification is inserted in place of the claims.]
(Specification, 4s. 6d; drawings, 1s.)

No. 18920.—29th December, 1904.—CHARLES BOWTELL SMITH, of Dunedin, New Zealand, Printer. The Geneva gear numbering and recording machine.

Claims.—(1.) In a numbering and recording machine, Geneva single tooth and notched Geneva wheels for locking and operating the number sets, all substantially as set forth. (2.) In combination, Geneva gearing, with spur gearing, for giving positive action from the prime mover to the number sets and each figure thereof, all substantially as set forth. (3.) In a numbering or recording machine, in combination, reel-frames capable each of carrying several numbering sets directly driven from a prime mover by spur and Geneva gearing to each figure of the numbering sets, all substantially as set forth. (4.) In a numbering and recording machine, in combination, change-wheel gearing arranged in a revolving reel frame to change the progression of the numbering by the numbering sets, the whole so arranged that each figure in each set is in gear at all times with the star wheel, all substantially as set forth. (5.) In a numbering and recording machine, the combination with said machine of gear so as to allow consecutive, duplicate, triplicate, quadruple, or quintuple repeated numbering to be automatically performed, all substantially as set forth. (6.) In a numbering and recording machine, the combination with the cylinder of a reciprocating printing machine of the shaft C and reel-frames D D¹ D¹ furnished with their change gearing and numbering sets, all substantially as set forth. (7.) In numbering and recording gear, as shown in Figs. 8 and 9, for close rotary work, the special form of gear consisting of combined spur and numbering wheels in combination with Geneva gearing, thus allowing all sets to be numbering sets, all substantially as set forth.
(Specification, 6s.; drawings, 1s.)

No. 18980.—21st January, 1905.—BENJAMIN LOCKING, of Tennyson Street, Napier, Hawke’s Bay, New Zealand, Medical Practitioner. Apparatus for generating vapour to be used in the destruction of weeds and rabbits.