Jan. 23.] THE NEW ZEALAND GAZETTE. 245

for electro-magnetic waves, and means for generating electro-magnetic waves, said elements being adapted to perform their functions simultaneously without interference one with the other. (12.) In a system of signalling by electro-magnetic waves, the combination at a station of a generator of electro-magnetic waves, two conductors, a receiver for electro-magnetic waves in operative relation to said conductors, said conductors being adapted to oppose the effects on the receiver produced by the generation of electro-magnetic waves at the station and to conjoin the effects on the receiver produced by electro-magnetic waves received at the station. (13.) In a system of signalling by electro-magnetic waves, the combination at the receiving station of a wave-responsive device, a circuit containing a microphonic contact controlled thereby, a conductor adapted to be heated by currents in said circuit, and an indicating-mechanism controlled by heat effects in said conductor. (14.) In a system of signalling by electro-magnetic waves, the combination at a station of two conductors and a receiver for electro-magnetic waves in operative relation to said conductors, said conductors being adapted to oppose the effects on the receiver produced by disturbing electrical impulses, while permitting waves of the desired periodicity to affect the receivers. (15.) In a system of signalling by electro-magnetic waves, a receiver so connected as to be unresponsive to effects produced by the generation of electro-magnetic waves at the same station as the receiver, but responsive to electro-magnetic waves received at the station, substantially as set forth. (16.) In a system of signalling by electro-magnetic waves, a receiver more sensitive to electro-magnetic waves received at the station than to effects produced by the generation of electro-magnetic waves of the same frequency at the station at the same time, substantially as set forth.

(Specification, 12s. 6d.; drawings, 3s.)

No. 15847.—7th January, 1903.—REGINALD AUBREY FESSENDEN, of Manteo, North Carolina, United States of America, Electrical Engineer. Improvements in current-operated receiver for electro-magnetic waves.

Claims.—(1.) In a system for signalling by electro-magnetic waves, the combination at the receiving station of a magnetic circuit, means for producing a magnetic flux in said circuit, and means operative by currents produced by electro-magnetic waves to change the direction of the flux, substantially as set forth. (2.) In a system for signalling by electro-magnetic waves, the combination at the receiving station of a magnetic circuit, means for producing in said circuit a magnetic flux practically constant in amount and normally varying in direction with practical uniformity, and means operative by electro-magnetic waves for changing the direction of the magnetic flux, substantially as set forth. (3.) In a system for signalling by electro-magnetic waves, the combination of a rotating magnetic field, means for producing a rotating magnetic flux, and means operative by currents produced by electro-magnetic waves for changing the angle between the direction of the field and that of the flux, substantially as set forth. (4.) In a system for signalling by electro-magnetic waves, the combination at the receiving station of a magnetic circuit, means for producing a magnetic flux in said circuit, means operative by currents produced by electro-magnetic waves to change the direction of the flux, and a circuit adapted to be energized by such change of direction of the flux, substantially as set forth. (5.) In a system for signalling by electro-magnetic waves, the combination of a rotating magnetic field, means for producing a rotating magnetic flux, means operative by currents produced by electro-magnetic waves for changing the angle between the direction of the field and that of the flux, and a circuit adapted to be energized by such change of angle between the field and the flux, substantially as set forth. (6.) In a system for signalling by electro-magnetic waves, the combination at the receiving station of a magnetic circuit, means for producing a magnetic flux in said circuit, means operative by currents produced by electro-magnetic waves to change the direction of the flux, and a circuit adapted to be energized by such change of direction of the flux, said circuit being arranged so as to be energized by the change of direction of the flux, but not by the normal rotations of the flux, substantially as set forth. (7.) In a system of signalling by electro-magnetic waves, the combination at the receiving station of a magnetic circuit, means for producing in said circuit a magnetic flux practically constant in amount and normally varying in direction with practical uniformity, means operative by electro-magnetic waves for changing the direction of the magnetic flux, and means for mechanically producing an indication by said change in direction of flux, substantially as set forth. (8.) In a system for signalling by electro-magnetic waves, the combination at the receiving station of a magnetic circuit, means for producing a magnetic flux in said circuit, and means operative by currents produced by electro-magnetic waves to

change the position of the flux, substantially as set forth. (9.) In a system of signalling by electro-magnetic waves, the combination at the receiving station of a magnetic circuit, means for producing in said circuit a magnetic flux practically constant in motion and normally varying in position with practical uniformity, and means operative by the electro-magnetic waves for changing the position of the magnetic flux, substantially as set forth. (10.) In a system of signalling by electro-magnetic waves, the combination at the receiving station of a magnetic circuit, means for producing a magnetic flux in said circuit, means operative by currents produced by electro-magnetic waves to change the position of the flux, and a circuit adapted to be energized by such change of position of the flux, substantially as set forth.

(Specification, 7s.; drawings, 2s.)

No. 15848.—7th January, 1903.—WILLIAM ERIC REYNOLDS, of Dunedin, New Zealand, Merchant. Improvements in ploughs.

Extract from Specification.—This invention relates to double- and treble-furrow ploughs and the like. It consists in improving the bearings of the land wheel and furrow wheel so as to render them dust-proof. The arbor is also secured in my plough by means of a pin to the crank-axle, instead of by projecting casting, as heretofore. The spacing-bar is also improved by rendering it more readily adjustable and making it more rigid than the one heretofore in use, in which considerable play resulted after adjustment. I also place a clip collar on the crank-axle between the main beams against the bearing, for the purpose of preventing a lateral movement of the crank-axle. The lever for adjusting the furrow wheel is now provided with a solid boss and set-screw, instead of being in halves as heretofore, for the purpose of preventing slip on the shaft, due to wear of the appliances heretofore used. The rear axle-gear is similarly provided, with the same object in view.

Claim.—The general construction, arrangement, and combination of parts composing my improvements in ploughs, all substantially as and for the purposes described with reference to the drawings.

(Specification, 2s. 3d.; drawings, 1s.)

No. 15851.—9th January, 1903.—HENRY ALBERT SEYMOUR, of 913, F Street, North-west Washington, Columbia, United States of America, Solicitor of Patents and Counsellor in Patent Causes. Apparatus for generating steam from hot slag.

Claims.—(1.) The combination with a steam-generator of a reciprocating and rotary plunger provided with a slag-receptacle, and adapted to feed charges of hot slag into the generator and to discharge them into the body of water contained therein, substantially as set forth. (2.) The combination with a steam-generator of a reciprocating and rotary plunger provided with two or more slag-receptacles, and adapted to feed charges of hot slag into the generator and discharge them into the body of water contained therein, substantially as set forth. (3.) The combination with a steam-generator and hoppers, one or more, of a plunger provided with one or more slag-receptacles, and suitable means for reciprocating and rotating the plunger, substantially as set forth.

(Specification, 5s. 6d.; drawings, 2s.)

No. 15853.—9th January, 1903.—FRANCIS JOHN NEWBERRY and ALFRED WALKER, both of corner of James and Virginia Streets, Geelong West, Victoria, General Ironfounders. An improved combination cast-metal combustion-chamber and fire-box for washing and other coppers.

Claim.—An improved combination cast-metal combustion-chamber and fire-box for a washing or other copper, consisting of a combustion-chamber having a flange around its top, a spiral or other circulating rib, a smoke-discharge hole with a dampered smoke-pipe, said pipe being bolted to the chamber or dropping into vertical grooves thereon, wrought-iron handles cast into bosses, said chamber having a contracted bottom in which are bolts securing it to the top of a fire-box having convex outer top sides, an ash-pit hole, a fire-door having stops beneath it, and protuberances supporting a fire-bar ring upon which rest the fire-bars, all as and for the purposes described and as illustrated in the drawings.

(Specification, 2s. 6d.; drawings, 1s.)

No. 15854.—9th January, 1903.—HENRY TRADWELL DAVIS, of 115, Lewisham Road, Lewisham, Kent, England, Engineer, and ERNEST PERRETT, of 103, George Lane, Lewisham