May 4.] THE NEW ZEALAND GAZETTE. 1101

through which the endless band passes, and a second series of sprocket-chains set back and forward and carrying brushes and gripping-plates to this series, substantially as and for the purposes described. (12.) Apparatus for treating and dressing flax and other fibres, comprising stripping apparatus, squeezing apparatus, and scutching apparatus, arranged and combined substantially as described, and illustrated in the drawings.
(Specification, 10s.; drawings, 4s.)

No. 19001.—24th January, 1905.—ROBERT COGHILL, of South Dunedin, New Zealand, Clerk. Improved safety envelopes.

Claim.—In envelopes specially designed to prevent unauthorised opening, in combination, the special interlacing of the flap, its being double-gummed and furnished with a hooked clip to catch under the edge of the side flap, with a thread or cord arranged principally to show the place for opening, all substantially as shown and described, and as illustrated in the drawing.
(Specification, 3s. 6d.; drawing, 1s.)

No. 19139.—25th February, 1905.—WILLIAM KIRBY WALLACE, Chemist, and JOHN WATT DEEM, Stock Inspector, both of Hawera, Taranaki, New Zealand. Apparatus for injecting sterilised air into the udders of cows.

Extract from Specification.—Our invention comprises a pump or syringe, the discharge end of which has a chamber in which is placed sterilised absorbent cotton or other sterilising agent.
[NOTE.—The above extract from the specification is inserted in place of the claims.]
(Specification, 2s.; drawing, 1s.)

No. 19217.—18th March, 1905.—THE CYANIDE VACUUM FILTER COMPANY, LIMITED, of 137, Suffolk House, Laurence Pountney Hill, London, England, Manufacturers (assignees of Percy John Ogle, of 4, Bishopsgate Street Within, London, England, Consulting Engineer, and Richard Kendall Evans, of 3, Church Court, Old Jewry, London, England, Engineer). Improvements in apparatus for the separation of liquids from solids.

Extract from Specification.—Attempts, however, have been made recently to effect the separation of liquids from solids by feeding the material to be treated upon an endless band, consisting of wire gauze carrying a sheet of fabric. This band passes over a vacuum box, so that the liquid is extracted, and solid matter is delivered more or less dry, and can be removed by a scraper or brush; and finally the band is cleaned by a washing-appliance ready for receiving further quantity of material for treatment. The mechanism in this case is of a somewhat complicated and delicate character, and risk of derangement would appear to be considerable, specially with regard to forming a joint between the endless band and vacuum box, as special arrangements have been designed to effect this purpose; and, further, the washing of the solid material has not been possible in the same machine as the separation, and distinct machines have been found necessary for the purpose. This invention substitutes simpler and more substantial mechanism for the endless filtering-band above described, and permits of a thorough washing of the solid matter with wash-water or secondary solution in the same machine as effect the original separation, and consists in the arrangement of a series of separate filtering-elements which are connected together so as to form an endless series, and may be carried by an endless chain or band substantially in the manner as obtains in well-known conveying apparatus used for the purpose of transporting material, or arranged in a ring formation, or as elements radiating from a centre and adapted to rotate about such centre. Each of the filtering-elements may consist of a preferably open box or receptacle having a filtering-medium supported across it, on to which said filtering-medium the material for treatment is delivered from a suitable delivery device. The space below the filtering-medium is connected to means for exhausting the atmosphere therefrom, whereby the rate of filtration is increased, and the solid matter is relieved of its moisture. This moisture may be withdrawn by the said exhausting-means, or, if necessary, a special delivery device may be provided for permitting the delivery of the liquid independent of the gaseous exhaustion. Means are provided for automatically connecting and disconnecting the exhausting-device with each filtering device or element at certain stages in the movement of the series. Means are also provided for delivering wash-water to the filtering-elements, so that the solid residue is thoroughly freed of any metal-carrying solvent that may be contained therein, the solvent solution being replaced ultimately by wash-water, and thus produce a high extraction of metal with a minimum of residual metal-carrying solvent. If found necessary means are provided for delivering a charge of air behind the solid residue at the point of discharge or near the same, so as to make it fall clear of the filtering-medium where the solid residue is being discharged from the filtering-element.
[NOTE.—The above extract from the specification is inserted in place of the claims.]
(Specification, 14s.; drawings, 6s.)

No. 19221.—20th March, 1905.—WILBUR ALSON HENDRYX, of Hotel Angeles, corner of Fourth and Spring Streets, Los Angeles, California, United States of America, Physician and Surgeon. A process for treating ores.

Extract from Specification.—My invention relates to a new and improved process for extracting gold, silver, copper, and other metals from ores as they are found in nature, and the objects of my process are: first, to extract the metallic values from finely crushed, ground, and pulverised ores as they are found in nature, by means of the combined use of chemical solutions, agitation, aeration, electrical precipitation and concentration; second, to provide a process for the recovery of the metallic values of ores by two different methods, and applications of restrengthened cyanide or other chemical solutions, and by agitation, aeration, and electrolytic deposition; third, to provide a process in which ore is recrushed and reground and pulverised in cyanide-solutions, after being broken up in the rock-breaker; fourth, to provide a process in which the ore, after being recrushed in the chemical solutions, is then treated by amalgamation in order that a percentage of the free gold and silver values may be recovered from the ores; fifth, to provide a process in which the ore is first reduced in chemical solutions to a suitable chemical ore-pulp solution, and is then treated by amalgamation, and is then ground and pulverised in cyanide or other solutions, or in cyanide and other solutions, and is then run into combined ore-pulp settling and classifying tanks and is settled, and the surplus solution is returned to the ore-recrushing battery stock-solution supply-tank, and the ore-pulp with such solution as permeates it is conveyed to an agitating and electrical-treatment tank, and is mixed in this agitating and electrical-treatment tank with a fresh supply of cyanide, or with any other suitable chemical or chemicals than cyanide, or with cyanide and other chemicals, depending on the character of the metallic compounds of the ore that it is required to dissolve, and that is adapted to assist the electrolytic action of suitable electrodes, thereby forming a restrengthened chemical ore-pulp solution; sixth, to provide a process in which the ore-pulp solutions are treated in a tank in which the ore-pulp is moved in contact with electrolytic electrodes that are adapted to collect the metallic values from the chemical ore-pulp solutions; seventh, to provide a process in which, after such of the metallic values as can be saved by amalgamation and electrical precipitation in suitable chemical ore-pulp solutions have been extracted from the ore-pulp, the ore-pulp is subjected to further treatment by concentration, to recover such particles of the minerals as are too coarse to be penetrated and dissolved by the chemical ore-pulp solutions, and that the amalgamation treatment did not collect, or that are insoluble in the chemical solutions used; eighth, to provide a process in which ores are continuously fed and recrushed after passing through a rock-breaker, and are then reground and repulverised continuously in cyanide or other chemical solutions, and the resulting ore-pulp amalgamated, and then run into settling and classifying tanks adapted to divide the ore-pulp into different-sized grades of ore-pulp, from the largest to the finest slimes, and in which the clear solution in the settling and classifying tanks is then returned to the ore crushing and grinding and pulverising machinery, and in which a charge of ore-pulp is then drawn from the different-sized classified ore-pulps from the settling and classifying tanks, and run into an agitating and aerating and electrical-precipitation tank and mixed with a restrengthened charge of cyanide, or with any other chemical or chemicals, to bring the resulting chemical ore-pulp solution up to the desired consistency, in a fixed charge of the tonnage-capacity of the tank in which said fixed charge is agitated and aerated, and the metallic values of the ores are extracted by electrolytic deposition, and to regenerate the chemical solutions, and then the chemical ore-pulp solutions are run into settling-tanks, and the solution is decanted or separated from the ore-pulp and is pumped back into the recrushing and grinding machinery, and the remaining ore-pulp is carried to further treatment by concentration; ninth, to provide a process in which the ore-pulp is mixed with chemical solvents into a chemical ore-pulp solution that is capable of decomposing the soluble compounds of the ore-pulp, separate the metals therefrom, and to facilitate the electrolytic action thereof and deposit the metals directly on suitable electrodes, and to regenerate the chemical solutions;