JUNE 29.] THE NEW ZEALAND GAZETTE. 1575

(4.) In a system of multiple-unit control for electric motors in which the controller-drum is electro-magnetically operated in a forward direction and the circuit of the actuating-magnet is controlled by two electro-magnets which are alternately energized through the operation of the drum-controller actuating-magnet, the arrangement for stopping the operation of the electro-magnetic make and brake device when an excessive amount of current is supplied to the motor circuits, substantially as described. (5.) In a system of multiple-unit control for electric motors, the arrangement for controlling the motor circuits by means of a switch included in the governing circuit and operated by an overload coil included in the main-power circuit in which the switch is held closed against a spring by tripping-gear which is released by the overload coil and is mechanically reset by the return final movement of the controller-drum to its initial position after the circuit of the retaining-magnet has been broken by the movement of the master switch to the “ off ” position, substantially as set forth. (6.) In a system of multiple-unit control for electric motors, an arrangement of train-control wires as set forth. (7.) In a system of multiple-unit control for electric motors, the arrangement whereby the governing circuits of the two magnet-windings for operating the reversing-switch are connected to a common return conductor through a switch which is normally closed and is opened by the closing movement of the first switch in the power circuit, substantially as set forth. (8.) In a system of multiple-unit control for electric motors in which the motor circuits are governed by electro-magnetically operated unit switches, the arrangement of resistance in series with each combination of switch-magnet coils in such a manner as to equalise the resistance of these parallel circuits, as set forth. (9.) In a system of multiple-unit control for electric motors, the arrangement for reducing the amount of current required to maintain the unit switches closed when the motors have been connected in full parallel, substantially as set forth. (10.) In a master switch, the arrangement of stationary pole-pieces at one end of the shaft and corresponding rotatable pole-pieces at the other end of and carried by the shaft so that both shaft and pole-pieces are included in the same magnetic circuit. (11.) In a master switch, the arrangement of a two-part blow-out winding-concentric with the shaft and connected to the segments in such a manner that in accordance with the direction of rotation of the shaft the one or the other part of the winding shall be energized to produce a magnetic flux between the stationary and rotatable pole-pieces in the one or the other direction. (12.) An arrangement for actuating the controller-drum for electric motors, comprising a pawl engaging with a ratchet-wheel secured to the controller-drum or shaft and actuated by a core or an armature of an electro-magnet for rotating the drum-controller in a forward direction against the resistance of a spring, and a second spawl engaging with the same or corresponding ratchet-wheel and actuated by a core or armature of a second magnet for retaining the controller-drum in position when operated in a forward direction, substantially as described with reference to Figs. 7 to 12. (13.) The arrangement for securing the controller-drum in its initial position as described. (14.) In an electro-magnetically operated reversing-switch, means actuated by the movement of the switch for making and breaking the circuits of the operating magnet-windings, substantially as described.

(Specification, £1 2s. ; drawings, 4s.)

No. 19469.—15th May, 1905.—BERTRAM HUNT, of Tres Amigos Mine, Punta Arenas, Costa Rica, Central America, Metallurgical Chemist. Improvements in the separation of liquids from solids.

Extract from Specification.—In carrying out the invention the material to be separated is disposed in a vertical mass, preferably of pyramidal form, of sufficient height to cause an adequate pressure therein by its own weight, and with inclination of its sides sufficient to overcome adhesion to or friction in the vessel containing it, and to permit of the mass descending as fast as its liquid contents separate from it, means being provided for removing the solid material from the base of the mass at a speed so proportioned to the supply at the top that a constant head and consequently a constant pressure are maintained in the mass, and for retaining filtering material in the walls of the vessel, and directing the exuded liquid therethrough and away from the mass, while means for resaturating the material under treatment with water, for example, to wash out chemical solutions in the cyanide process of gold-extraction, may be provided.

[NOTE.—The above extract from the specification is inserted in place of the claims.]

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

No. 19470.—15th May, 1905.—EMIL LAURENCE OPPERMANN, of 21, Ashworth Mansions, Elgin Avenue, London, England, Electrical Engineer. Improvements in and relating to electric secondary batteries.

Claims.—(1.) A composite material for secondary electric battery-plates, consisting of a mixture of active material with hair, wool, or like substance in a state of fine subdivision, substantially as described. (2.) A plate for a secondary electric battery, consisting of a grid or other device supporting a mixture of active oxide and hair, wool, or like substance in a state of fine subdivision, substantially as described.

(Specification, 2s. 6d.)

No. 19471.—15th May, 1905.—THE FISH OIL AND GUANO COMPANY, LIMITED, of Dunster House, Mark Lane, London, E.C., England (assignee of John Charles William Stanley, of New York, United States of America, Engineer). Improvements in or relating to the treatment of fish and other offal or similar refuse.

Claims.—(1.) In the treatment of fish and other animal matter or similar refuse, boiling and disintegrating it beneath a submerged perforated barrier. (2.) For the treatment of fish and other animal matter or similar refuse, a cooking-vessel A containing a barrier C or equivalent, and below the barrier a conveyor, substantially as described. (3.) In the treatment of fish and other animal matter or similar refuse, the combination with a cooking-vessel such as A and its appurtenances B and C or equivalent apparatus of an elevator working in an extension such as G of the vessel A. (4.) In the treatment of fish and other animal matter or similar refuse for the purposes specified, the combination with a cooking-vessel of a submerged grating C or other barrier, and means, substantially as described, for introducing or permitting the introduction below the barrier of the material to be treated, and for churning and reducing the same, and for simultaneously removing the residual solids, all without interruption of the continuity of the process. (5.) In the treatment of fish and other animal matter or similar refuse, the combination with a cooking-vessel which has a submerged grating C or other barrier, and is arranged to permit the flow of liquid from above the barrier into a settling tank, of apparatus for producing a circulation of the liquid through the cooking-vessel and the tank and other parts of the apparatus for the purpose described. (6.) In the treatment of fish and other animal matter or similar refuse, apparatus comprising a cooking-vessel, means for heating the same, a conveyor B and grating C, the vessel A being provided with openings D and E below the grating for the admission and exit of the solid particles of the material under treatment, and with an opening or weir A² above the grating for the outflow of the oil, substantially as described. (7.) In the treatment of fish and other animal matter or similar refuse, the combination with the tank A of an oil-receptacle N with devices for drawing the water from the lower part thereof and returning it into the tank A at or near the surface of the oil or other liquid therein. (8.) In the treatment of fish and other animal matter or similar refuse, an elevator or conveyor with each of its buckets provided with one or more openings for escape of liquid, these openings being so disposed that the liquid passing through them will not fall on to the buckets beneath. (9.) In the treatment of fish and other animal matter or similar refuse, an elevator or conveyor each bucket of which is provided with a perforated or equivalent false bottom and with one or more openings beneath the false bottom in the bucket-wall, substantially as and for the purpose described. (10.) In the treatment of fish and other animal matter or similar refuse for the purpose specified, the combination with elevator buckets provided with liquid outlets as described of one or more pipes J, substantially as and for the purpose described. (11.) An apparatus in which fish or other animal matter or similar refuse is cooked and broken up in a liquid, which is kept in circulation and employed to convey away through a barrier which keeps back the solids the oil rising to the surface of said liquid whilst the residual solids are removed by conveyors or the like. (12.) The process of producing fish guano, substantially as described. (13.) In the manufacture of fish guano, a process comprising the boiling and disintegration of fish offal below a submerged grating whereby the oil is separated therefrom, removal of the boiled residue, and the squeezing, drying, and sifting of the same, substantially as described. (14.) In the manufacture of fish guano, the obtainment of oil by boiling and disintegrating fish offal below a submerged grating, substantially as described. (15.) In the manufacture of fish guano, boiling the material, separating the larger bones from the meat in a worm conveyor having a perforated bottom, and compressing the meat, substantially as described. (16.) Fish guano, the product of the process described. (17.) In the recovery or