sequence: ($a$) Roasting the ore to oxidize and sulphate its metallic constituents; leaching the roasted pulp with hot or cold water or dilute sulphuric acid to obtain sulphates in solution; ($b$) triturating the pulp residuum from which the sulphate lixivium has been drawn off with hot brine, thereby converting lead-sulphate into lead-chloride; leaching the lead-chloride therefrom with hot water, and extracting it from solution by cooling down to crystallize, or by precipitating it with an alkaline reagent, or both, and obtaining the gold by chlorination or cyanidation, or alternatively smelting the pulp to obtain the gold and lead; ($c$) precipitating silver from the sulphate lixivium by adding chloride of sodium thereto; and thereafter successively depositing copper by contact with iron, and tin by contact with zinc; finally precipitating zinc and iron by an alkaline reagent, and separating the zinc-and-iron precipitate by elutriation or by fuming off the zinc in a furnace: substantially as described. (2.) In the treatment of sulphate-or chloride-solutions containing tin, extracting the tin by bringing the solution into contact with metallic zinc, and subsequently recovering the zinc by precipitation with an alkaline reagent, or by fuming off in a furnace, substantially as described. (3.) The described process of treatment of complex ores consisting of the combination of the following steps in sequence: ($a$) Chlorinating or chloridizing the ore; lixiviating with hot water; ($b$) washing the pulp with agitation, and elutriating the lighter deposit to separate the bismuth, antimony, and zinc oxychlorides; ($c$) crystallizing the lead-chloride out of the hot lixivium by cooling the same; ($d$) leaching the ore-residue with hyposulphite solutions or cyaniding it to obtain the silver; ($e$) extracting gold from the lixivium by contact with charcoal or by ferrous-sulphate precipitation or other known treatment, copper by contact with iron, and tin by contact with zinc; and precipitating zinc and iron with an alkaline reagent; finally separating the zinc-and-iron deposit by elutriation or by fuming off the zinc in a furnace: substantially as described. (4.) The described process of treatment of complex ores consisting of the combination of the following steps in sequence: ($a$) Chlorinating or chloridizing the ore; leaching with cold water; ($b$) washing the ore-residue with cold water, and elutriating the bismuth and antimony oxychloride deposit which constitutes the specifically lighter portions thereof; ($c$) extracting lead and silver from the specifically heavier ore-residue by smelting, or the lead by leaching the same with hot water; crystallizing out the lead by cooling the solution; and subsequently hyposulphiting or cyaniding the ore-residue to obtain the silver; and ($d$) from the lixivium extracting gold by contact with charcoal, or by ferrous-sulphate precipitation, or other known treatment, copper by contact with iron, tin by contact with zinc, and zinc and iron by precipitation with an alkaline reagent, and subsequent elutriation or furnace treatment: substantially as described. (5.) The described process of treatment of complex ores consisting of the combination of the following steps in sequence: ($a$) Chlorinating or chloridizing the ore; lixiviating with hot water; ($b$) washing the pulp with agitation and elutriating the lighter deposit to separate the bismuth, antimony, and zinc oxychlorides; ($c$) crystallizing the lead-chloride out of the hot lixivium by cooling the same; ($d$) leaching the ore-residue with hyposulphite solutions, or cyaniding it to obtain the silver; ($e$) extracting gold from the lixivium by contact with charcoal or by ferrous-sulphate precipitation or other known treatment, copper by contact with iron, and precipitating zinc and iron with an alkaline reagent; finally separating the zinc-and-iron deposit by elutriation or by fuming off the zinc in a furnace: substantially as described. (6.) The described process of treatment of complex ores consisting of the combination of the following steps in sequence: ($a$) Chlorinating or chloridizing the ore; leaching with cold water; ($b$) washing the ore-residue with cold water and elutriating the bismuth and antimony oxychloride deposit which constitutes the specifically lighter portions thereof; ($c$) extracting the lead and silver from the specifically heavier ore-residue by smelting, or the lead by leaching the same with hot water, crystallizing out the lead by cooling the solution, and subsequently hyposulphiting or cyaniding the ore-residue to obtain the silver; and ($d$) from the lixivium extracting gold by contact with charcoal, or by ferrous-sulphate precipitation or other known treatment, copper by contact with iron, and zinc and iron by precipitation with an alkaline reagent and subsequent elutriation or furnace treatment: substantially as decribed.

(Specification, 10s.)

Nov. 14.]

THE NEW ZEALAND GAZETTE.

2225

Linotype Works, Broadheath, Chester, England). Improvements in the moulds and casting-mechanisms of linotype machines.

Claims.--(1.) The combination of mould-carrier adapted to carry either a normal linotype mould-block or a fudge linotype mould-block, reciprocating metal-pot adapted to make metal-tight contact with the mould-block on the mould-carrier, cam adapted to move the nozzle of the metal-pot up to the mould-block, compound antifriction roller on the metal-pot and having two peripheries of different diameters corresponding respectively with the distances which the nozzle of the metal-pot must be moved to make the contact above mentioned, and means for locking the said roller with either of its peripheries running on the said cam. (2.) The combination of mould-carrier adapted to carry either a normal linotype mould-block or a fudge linotype mould-block, reciprocating metal-pot adapted to make metal-tight contact with the mould-block on the mould-carrier, cam adapted to move the nozzle of the metal-pot up to the mould-block, compound antifriction roller on the metal-pot and having two peripheries of different diameters corresponding respectively with the distances which the nozzle of the metal-pot must be moved to make the contact above mentioned and capable of adjustment upon its axle to put either periphery on the said cam, and means for locking the said roller in its adjusted position. (3.) The combination of mould-carrier, mould-block thereon standing at a little distance therefrom, and thereby establishing a clear space between them, knife adapted to trim the foot of the linotype by being held with its edge in the proper plane, and means for moving the untrimmed foot of the linotype past the said edge. (4.) The combination of mould-carrier adapted to carry either a normal linotype mould-block or a fudge linotype mould-block, reciprocating metal-pot adapted to make metal-tight contact with the mould-block on the mould-carrier, cam adapted to move the nozzle of the metal-pot up to the mould-block, compound antifriction roller on the metal-pot and having two peripheries of different diameters corresponding respectively with the distances which the nozzle of the metal-pot must be moved to make the contact above mentioned, means for locking the said roller with either of its peripheries running on the said cam, mould-block on the said mould-carrier, standing at a little distance therefrom and thereby establishing a clear space between them, knife adapted to trim the foot of the linotype by being held with its edge in the proper plane, and means for moving the untrimmed foot of the linotype past the edge. (5.) The combination of mould-carrier adapted to carry either a normal linotype mould-block or a fudge linotype mould-block, reciprocating metal-pot adapted to make metal-tight contact with the mould-block on the mould-carrier, cam adapted to move the nozzle of the metal-pot up to the mould-block, compound antifriction roller on the metal-pot having two peripheries of different diameters corresponding respectively with the distances which the nozzle of the metal-pot must be moved to make the contact above mentioned, and capable of adjustment upon its axle to put either periphery on the said cam, means for locking the said roller in its adjusted position, mould-block on the said mould-carrier, standing at a little distance therefrom, and thereby establishing a clear space between them, knife adapted to trim the foot of the linotype by being held with its edge in the proper plane, and means for moving the untrimmed foot of the linotype past the said edge. (6.) The combination with the metal-carrier, the metal-pot, and cam described, of the modification in respect of the antifriction roller and locking-device illustrated in Figs. 8 to 10, and described therewith. (7.) The combination with the mould-carrier, the metal-pot, and cam described, of the modification in respect of the antifriction roller and locking-device illustrated in Figs. 11 to 14, and described therewith.

(Specification, 9s. 6d.; drawings, 4s.)

No. 14202.--7th November, 1901.--RENDROCK POWDER COMPANY, a corporation organized under the laws of the State of New Jersey, and having a place of business at 128, Broadway, New York, United States of America (assignees of William Angus Gill, of Tarrytown, Westchester, New York, aforesaid, Chemist). Improvements in explosive compounds.

Claims.--(1.) An absorbent for liquids in making explosives, comprising a mixture of marble-dust and chlorate of potash, substantially as described. (2.) The explosive compound described, which consists essentially of a mixture of marble-dust, chlorate of potash, and nitro-benzol, united substantially as described, and in the proportions stated in the specification.

(Specification, 2s. 3d.)

No. 14199.--6th November, 1901.--EDWARD WATERS, Jun., a member of the firm of Edward Waters and Son, Patent Agents, of 414-418, Collins Street, Melbourne, Victoria (nominee of the Linotype Company, Limited, of 188, Fleet Street, London, England, the assignees of Charles Holliwell, of the