244
THE NEW ZEALAND GAZETTE.
[No. 6

concentrator with an endless belt, a drum at either end over which the belt passes, a worm gear the members of which are movable one relative to the other and through which motion is transmitted to the belt, a swivelled bearing supported from the movable member of the worm gear and receiving the shaft of the other member of said gear, elastic legs fixed at the bottom and having the upper ends formed to support the frame, and means connected with the legs to raise or lower and adjust the frame. (4.) In an endless-belt concentrator, a belt, and drums over which it passes, a driving-gear and a worm the shaft of which is parallel with the machine frame, a swivelled bearing for the outer end of said shaft, and means whereby the worm is moved relative to the said gear, cone-pulleys one of which is carried by the worm-shaft and the other on the driving-shaft, a belt around said cone-pulleys, a belt-shifting yoke and a guided rod by which it is carried, and means located at the head end of the machine by which the rod is moved to shift the belt. (5.) In a concentrator, a frame, and endless belt and drums over which it passes, a power-transmitting mechanism, including a worm gear, the members of which are movable one relative to the other, elastic supports upon the upper ends of which the frame is carried, fixed angular slotted brackets, and clamps to which the lower ends of the elastic supports are fixed, said clamps being adjustable upon the brackets, and holding-nuts for the clamps. (6.) In a concentrator having an endless travelling belt, and a frame with drums at each end around which the belt passes, elastic supports for the frame, and means located at the upper ends of the supports by which the frame may be vertically adjusted.
(Specification, 7s. ; drawings, 2s.)

No. 15844.—7th January, 1903.—THE CLAYTON FIRE-EXTINGUISHING AND VENTILATING COMPANY, LIMITED, of 22, Craven Street, London, W.C., England, Manufacturers (assignees of Thomas Adam Clayton, of 212, West Coulter Street, Germantown, Philadelphia, United States of America, also of 22, Craven Street aforesaid, Accountant). Improved apparatus for the generation and delivery of hot or cold gas for fumigation, sterilisation, the extinguishing of fires, and the like.

Claims.—(1.) An apparatus for the generation and discharge of sterilising or non-flame-supporting gas, so arranged that the gases, whether delivered in a hot or cold condition, are first cooled before entry into the aspirating-fan, and if required hot are afterwards reheated by circulating tubes in the combustion-chamber, thus effecting maximum efficiency as regards weight of sulphur sublimed per grate-area, substantially as described. (2.) An apparatus as claimed in claim 1, comprising, in combination, a sulphurous-acid-gas generating-chamber, a controllable entry of air to the same, baffle-plates in said generator, supplementary air-inlets above and below said baffle-plates, a surface-condenser in gas-outlet from generating-chamber, and an aspirating-fan or blower beyond said condenser, as and for the purposes substantially as described. (3.) An apparatus as claimed in claim 1, comprising, in combination, a sulphur-combustion chamber or gas-generator, an aspirating-fan or blower with-drawing and discharging gas from the generator, a condenser introduced into the main between the generator and the aspirating-fan or blower, and an alternative delivery from said blower controlled by a cock passing through reheating-tubes in the upper part of the combustion-chamber, substantially as and for the purposes described. (4.) The arrangement, construction, and combination of parts forming an apparatus for the generation and discharge of sterilising or non-flame-supporting gas, substantially as described, and illustrated in the drawings.
(Specification, 4s. ; drawings, 1s.)

No. 15845.—7th January, 1903.—MAITLAND LUMLEY, of 1, America Square, London, England, Bottlers’ Engineer, and JEAN BAPTISTE BOURSEAU, of 141, Avenue Parmentier, Paris, France, Engineer. An improved reducing-valve.

Claims.—(1.) The improved valve comprising a casing formed in two parts, the upper of which is divided by means of a partition into two parts, and the lower of which is chambered and is provided with a means of adjustment for a regulating spring, caps at the respective ends of the casing, the upper of which is provided upon its under surface with a conical projection forming the termination of the inlet, and which inlet is normally closed by means of a disc or block of rubber upon the upper end of a hollow spindle down which the gas or fluid passes to the discharge-orifice, springs located within the chambers formed in the upper portion of the casing, and suitable washers to prevent any leakage between the said chambers, and also means to permit of the escape of any gas or fluid that may pass from one chamber to the other, all arranged, constructed, and operating substantially as described, and illustrated by the drawings. (2.) In a valve of the kind described, a means whereby the pressure at which the valve works may be regulated by means operable from the exterior of the valve, substantially as described, and illustrated by the drawings. (3.) The general combination and arrangement of parts constituting the improved valve, substantially as described, and illustrated by the drawings.
(Specification, 5s. ; drawings, 1s.)

No. 15846. — 7th January, 1903. — REGINALD AUBREY FESSENDEN, of Manteo, North Carolina, United States of America, Electrical Engineer. Selective signalling by electro-magnetic waves.

Claims.—(1.) In a system of signalling by electro-magnetic waves, the combination at the sending station of means for generating electro-magnetic waves of the same character, means for causing the emission of such waves in two or more groups at different emission-rates, and at the receiving station an indicating-mechanism operative by the conjoint action of the respectively responsive devices. (2.) In a system of signalling by electro-magnetic waves, the combination of means at the sending station for generating electro-magnetic waves of the same character, means for causing the emission of such waves in two or more groups at different emission-rates, means at the receiving station responsive respectively to the groups of waves, and an indicating-mechanism operative by the conjoint action of the respectively responsive devices. (3.) In a system of signalling by electro-magnetic waves, the combination of means at the sending station for generating electro-magnetic waves of the same character, means for causing the emission of such waves in two or more groups at different emission-rates, means at the receiving station electrically tuned to respond to electro-magnetic waves of the character emitted, means mechanically tuned to respond respectively to the groups of waves in operative relation to the receiving-means, and an indicating-mechanism operative by the conjoint action of the mechanically tuned respectively responsive devices. (4.) In a system of signalling by electro-magnetic waves, the combination at the sending station of means for generating electro-magnetic waves of the same character, and means of causing the emission of sets of groups of waves, each set consisting of two or more groups of different emission-rates. (5.) In a system of signalling by electro-magnetic waves, the combination of a plurality of devices at the receiving station responsive respectively to groups of waves of different emission-rates, and indicating-mechanisms operative by the action of sets of the respectively responsive devices, each set consisting of two or more respectively responsive devices acting conjointly. (6.) In a system of signalling by electro-magnetic waves, the combination of means at the receiving station electrically tuned to respond to electro-magnetic waves of a single periodicity, means mechanically tuned to respond respectively to groups of different emission-rates, in operative relation to the receiving-means, and indicating-mechanisms operative by the action of sets of the mechanically tuned respectively responsive devices, each set consisting of two or more respectively responsive devices, acting conjointly. (7.) In a system of signalling by electro-magnetic waves, the combination of means at the sending station for generating electro-magnetic waves of the same character, means for causing the emission of sets of groups of waves, each set consisting of two or more groups of different emission-rates, means at the receiving station responsive respectively to the groups of waves, and indicating-mechanisms operative by the action of corresponding sets of the respectively responsive devices, the components of each set acting conjointly. (8.) In a system of signalling by electro-magnetic waves, the combination of means at the sending station for generating electro-magnetic waves of the same character, means for causing the emission of sets of groups of waves, each set consisting of two or more groups of different emission-rates, means at the receiving station electrically tuned to respond to electro-magnetic waves of the character emitted, means mechanically tuned to respond respectively to the groups of waves in operative relation to the receiving-means, and indicating-mechanisms operative by the action of corresponding sets of the respectively responsive devices, the components of each set acting conjointly. (9.) In a system of signalling by electro-magnetic waves, a receiver responsive to electro-magnetic waves received at the station while at the same time unresponsive to effects produced by the generation of electro-magnetic waves at the station. (10.) 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. (11.) In a system of signalling by electro-magnetic waves, the combination at a station of a receiver