Dec. 6.] THE NEW ZEALAND GAZETTE. 2219

a complete cycle of movements, beginning with the setting of the signal to safety, then the setting of the switch to its reverse position, then the returning of the switch to its normal position, and then the resetting of the signal to danger. The construction of the apparatus is such that this cycle of movements must be accomplished in order to set and return the switch. The combination between the switch-mechanism and the signal-mechanism is through a suitable interlocking board, such, for instance, as one of the Saxby and Farmer type, although the switch and the signal mechanism may be employed independently.

[NOTE.—The number and length of the claims in this case preclude them from being printed, and the foregoing extract from the descriptive part of the specification is inserted instead.]

(Specification, £2 12s.; drawings, 3s.)

No. 13189.—23rd November, 1900.—THE BRITISH WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, LIMITED, of Westinghouse Building, Norfolk Street, Westminster, England, Manufacturers (assignees of Henry Russell Kent, of 26, Cortlandt Street, New York, United States of America, Electrical Engineer). Improvements in systems of electrical distribution.

Claims.—(1.) In a system of electrical distribution, a secondary battery and one or more dynamo-electric generators, one of the field-magnet windings of said generator or of each of said generators being connected between one pole of the battery and the portion of the system where the current supply is utilised, substantially as described. (2.) Systems of electrical distribution arranged and operated as described with reference to the drawings.

(Specification, 2s.; drawings, 1s.)

No. 13192.—28th November, 1900.—THE AMPERE ELECTRO-CHEMICAL COMPANY, of 60, Grand Street, Jersey City United States of America, Manufacturing Chemists (assignees of Nathaniel Thurlow, of Newark, Essex County, New Jersey, United States of America, Chemist). Improvements in process for the production of camphor.

Claims.—(1.) The process of producing camphor which consists in acting on turpentine with oxalic acid at a suitable temperature. (2.) The process of producing camphor which consists in heating anhydrous turpentine with anhydrous oxalic acid. (3.) The process of producing camphor which consists in acting on turpentine with oxalic acid, producing borneol and camphor, and then oxidizing the borneol to convert it into camphor. (4.) The process of producing camphor which consists in acting on turpentine with oxalic acid, acting on the resulting mixture with lime, and distilling to separate the borneol and camphor, and oxidizing the borneol to convert it into camphor. (5.) The compound, pinyl oxalate, produced by the action of oxalic acid on turpentine, and having the following structural formula: [Formula is here shown]. (6.) The compound, pinyl formate, resulting from the action of oxalic acid on turpentine, and having the following structural formula: [Formula is here shown].

(Specification, 6s.)

No. 13193.—28th November, 1900.—THOMAS ROWLAND JORDAN, of 47, West Forty-second Street, New York, United States of America, Mining Engineer. Improvements in and relating to apparatus for the separation of ores.

Claims.—(1.) In apparatus for the extraction and separation of minerals, the combination of a casing receiving screened minerals and other materials and water, and having outlets in its lower end, and concentrating-tubes connected with said outlets, each of the tubes having a restricted passage between upper and lower chambers, and having an inlet for water at the lower chamber. (2.) In apparatus for the extraction and separation of minerals and other materials, the combination of a casing having outlets in its lower end, concentrating-tubes connected with said outlets, a screen towards the upper end of the casing, a hopper above the screen having an outlet for material and water, and means for regulating the flow from the outlet to distribute or spread the material and water over the screen. (3.) In apparatus for the extraction and separation of minerals and other materials, the combination of a casing having outlets in its lower end from which lead nozzles, concentrating-tubes connected with said nozzles, a rotatable brush in the casing arranged to free the outlets and keep the particles in motion, a screen towards the upper end of the casing, water-jet pipes adjacent to the screen, and a hopper arranged to deliver material and water over the whole surface of the screen. (4.) In apparatus for the extraction and separation of minerals and other materials, the combination of a casing having outlets in its lower end, nozzles adjustably secured to said outlets, said nozzles having apertures slightly tapered towards the inlet end and abruptly tapered adjacent to said inlet end, and concentrating-tubes connected with said nozzles. (5.) In apparatus for the extraction and separation of minerals and other materials, the combination of a feeder and a plurality of tubes, one of which is connected with the feeder, inlets for water in controllable quantity towards the lower ends of each tube, and an adjustable siphon connection between the upper portions of certain of the tubes. (6.) In apparatus for the extraction and separation of minerals and other materials, the combination of a feeder, concentrating-tubes connected with the feeder, each tube having an upper and a lower chamber connected by a restricted passage, a valve-seat below the restricted passage, a valve adjustable to or from said seat, and an inlet for water below the valve. (7.) In apparatus for the extraction and separation of minerals and other materials, the combination of a feeder, a series of concentrating-tubes having water-inlets towards their lower ends, a valved water-supply pipe, a branch pipe leading from the supply-pipe to each inlet, and a valve for each branch.

(Specification, 6s. 6d.; drawings, 3s.)

No. 13194.—28th November, 1900.—THOMAS ROWLAND JORDAN, of 47, West Forty-second Street, New York, United States of America, Mining Engineer. Improvements in and relating to amalgamating apparatus.

Claims.—(1.) In an amalgamating apparatus, the combination with a vertical spindle, having means for its rotation, of a sleeve fixed to the spindle to rotate therewith, said sleeve being formed in separate sections, each of which is provided towards its upper end with an annular flange and towards its lower end with vertical ribs, a concave receiving-dish fixed to the flange of each section, and a delivery-dish of relatively greater concavity having an outlet in its bottom and fixed to the ribs, whereby each of the set of receiving- and delivery-dishes is separable from the other sets. (2.) In an amalgamating apparatus, the combination with a vertical spindle, and means for rotating the same, of a tube surrounding the spindle, having at its upper end a drip-cup for oil, a sleeve surrounding the tube and keyed to it and the spindle, said sleeve being formed in separate sections, and a receiving-dish and delivery-dish fixed to each section. (3.) In an amalgamating apparatus, the combination with a vertical spindle, and means for rotating the same, of a tube surrounding the spindle, a sleeve of the described material surrounding the tube and keyed to the spindle, a hopper near the upper end of the spindle, a series of sets of receiving-dishes and delivery-dishes carried by the sleeve, a concentrating-pan below the spindle, and discharge-tubes carried by and leading from the lowermost delivery-dish into the pan. (4.) In an amalgamating apparatus, the combination with a vertical spindle, having means for its rotation, of a tube surrounding the spindle, a sleeve surrounding the tube and keyed to it and the spindle, said sleeve being formed in separate sections, a receiving-dish and a delivery-dish fixed to each section, a concentrating-pan having concentric wells, and discharge-tubes leading from the lowermost delivery-dish into the inner well and operating to agitate the material therein.

(Specification, 4s. 6d.; drawings, 1s.)

No. 13195.—28th November, 1900.—THOMAS ROWLAND JORDAN, of 47, West Forty-second Street, New York, United States of America, Mining Engineer. Improvements in and relating to crushing-machines.

Claims.—(1.) In a crushing or reducing machine, the combination of a pan rotatably mounted and supported on rollers, said pan having a recess in its bottom, a false bottom removable seated in the recess and having an annular groove for containing mercury, crushing-rolls adapted to revolve on said false bottom, spindles on which the rolls are mounted, said spindles being pivoted at one end and guided and adjustably weighted at the other end, and a siphon pipe or pipes adjustably mounted and extending into the pan. (2.) In combination with the pan of a crushing or reducing machine, rotatably mounted on a tubular spindle, a siphon pipe adjustably arranged within the spindle and discharging below the same, said pipe having a branch or branches extending into the pan. (3.) In combination with the rotatable pan of a crushing or reducing machine, a plurality of crushing-rolls adapted to revolve on the bottom of the pan, and amalgamated baffle-plates suspended on hangers and extending into the pan at intervals. (4.) In combination with the rotatable pan of a crushing or reducing machine, a siphon pipe having a flexible branch extending into the pan, and means for raising and lowering the receiving end of the flexible branch. (5.) In combination with the rotatable pan of a crushing or reducing machine, a siphon pipe having a flexible branch extending into the pan, means for vertically adjusting the siphon pipe, and separate means for raising and lowering the receiving end of the flexible branch.

(Specification, 5s.; drawings, 1s.)