June 22.] THE NEW ZEALAND GAZETTE. 1187

principals of great strength, simplicity of construction, and lightness, substantially as described, and illustrated by way of example as to the main construction in Figs. 17 and 22, and by way of detail in Figs. 18, 19, and 23. (7.) In a structural arrangement as characterized by claim 6, the use of slotted tubular rafters set to a curve requiring no ties or struts, whereby a shell covering is readily interlocked to principals of great strength, simplicity, and lightness, and without rivets or bolts on the roof-surface, substantially as described, and illustrated in Fig. 20, and by way of detail in Fig. 21. (8.) In roofs and the like structural work, the use, in substitution of slotted tubes and panels interlocked therewith by inset flanges, of beams or bearers recessed between upper and lower flanges for the reception of the panel-edge, interlocked tongue-and-groove fashion into the upper flange by wedges and the wedge-shaped ends of stiffeners, substantially as described, and illustrated by way of example in Figs. 24 and 25.
(Specification, 12s. 6d.; drawings, £1 2s.)

No. 11693.—4th November, 1898.—GUY DE BECHI, of 17, Boulevard de la Madeleine, Paris, France, Chemical Engineer. Improvements in the treatment of complex ores.
[NOTE.—This is an application under section 106 of the Act, the date given being the official date in Great Britain.]

Claims.—(1.) The method of treating ores consisting in roasting the ore and an alkaline chloride salt in separate furnaces into which steam is injected, passing the vapours and gases from the ore over and in contact with the salt so as to produce a sulphate, recovering the gases finally issuing from the roasting-chamber, lixiviating the roasted ore with the liquor containing said gases, and separating the metals dissolved in said liquor by fractional precipitation, substantially as described. (2.) In the method referred to in claim 1, the mixture of pyrites with the ore, substantially as and for the purposes specified. (3.) The method of treating complex ores for the recovery of metals therefrom substantially as described and for the purposes specified.
(Specification, 7s. 6d.)

No. 11694.—8th June, 1899.—ALFRED MALLABONE LINNEY, of Bedworth, Warwickshire, England, Ironmonger. Improvements in or relating to pneumatic-tire air-tubes and the like.

Claims.—(1.) A detachable joint for a continuous-chambered pneumatic-tire air-tube, or the like, consisting of a flexible and sufficiently incompressible ring at one end of the tube, overlapped by the other end of the tube. (2.) In a detachable joint for a continuous-chambered pneumatic-tire air-tube, or the like, a flexible and sufficiently incompressible ring formed on one end of the tube, or the like. (3.) In a detachable joint for a continuous-chambered pneumatic-tire air-tube, or the like, a flexible and sufficiently incompressible ring attached to one end of the tube, or the like. (4.) In a detachable joint for a continuous-chambered pneumatic-tire air-tube, or the like, a flexible and sufficiently incompressible ring placed within and separable from one end of the tube, or the like. (5.) In a detachable joint for a continuous-chambered pneumatic-tire air-tube, or the like, comprising a ring of the kind referred to, forming such ring with one or more circumferential grooves. (6.) In a detachable joint for a continuous-chambered pneumatic-tire air-tube, or the like, forming the overlapping end of reduced transverse circumference. (7.) In a detachable joint for a continuous-chambered pneumatic-tire air-tube, or the like, providing the overlapping end with one or more strengthening ribs or bands. (8.) In a detachable joint for a continuous-chambered pneumatic-tire air-tube, or the like, providing the overlapping end with one or more contracted portions or corrugations. (9.) In a detachable joint for a continuous-chambered pneumatic-tire air-tube, or the like, contracting the overlapping end on to the ring by the elasticity of such overlapping end. (10.) In a detachable joint for a continuous-chambered pneumatic-tire air-tube, or the like, contracting the overlapping end on to the ring by means of elastic bands or cords, or the like. (11.) In a detachable joint for a continuous-chambered pneumatic-tire air-tube, or the like, smearing the contacting surfaces with birdlime or a like adhesive. (12.) A detachable joint for a continuous-chambered pneumatic-tire air-tube, or the like, constructed substantially as described with reference to Figs. I. and II. of the drawings. (13.) A detachable joint for a continuous-chambered pneumatic-tire air-tube, or the like, constructed with the modifications substantially as described with reference to Fig. III. of the drawings.
(Specification, 5s.; drawings, 3s.)

No. 11697.—8th June, 1899.—THOMAS CLEMENTS, of Launceston, Tasmania, Superintendent of Launceston Benevolent Asylum. Improvements in door-adjusting apparatus.

Claims.—(1.) In mechanism for holding in position, or controlling the movements of, hinged doors and gates of every description, when open or unfastened, the combination of the following essential parts: A bolt, or bar, enclosed in a suitable casing, in which it slides vertically and freely, carrying at its lower end a rubber-faced wheel or roller, which travels on the floor or ground, and is pressed firmly down thereto by a spiral spring coiled within the said casing, substantially as described by this specification and illustrated by drawings. (2.) In mechanism as referred to in claim 1, and in connection with the combination of parts therein described, an adjusting screw or nut, fitted into a screw-thread in the upper end of the casing, and regulating the pressure of the wheel on the floor or ground by either compressing or relaxing the spiral spring which exerts that pressure, substantially as described, and illustrated by drawings. (3.) In mechanism as referred to in claim 1, and in connection with the combination of parts therein described, or the further combination included in claims 1 and 2, a crank-arm, or eccentric disc and strap, attached to the door-handle and connected with the upper end of the sliding bolt in such a way that on turning the handle to open the door the bolt and wheel are raised clear of the floor or ground, and remain inoperative until the handle is released, the spiral spring then bringing the wheel down instantly to the floor or ground again, substantially as described, and illustrated by drawings.
(Specification, 5s. 6d.; drawings, 5s. 6d.)

No. 11702.—9th June, 1899.—GEORGE GIRLING, of New Plymouth, Taranaki, New Zealand, Labourer. An improvement in stonebreakers’ hammers.

Claim.—In a stonebreaker’s hammer, a head of solid steel in the shape of a disc with chamfered edges, fitted with a hole for the reception of a handle, substantially as described.
(Specification, 1s.; drawings, 3s.)

No. 11703.—12th June, 1899.—JOHN PENDER, of Tinning Street, Brunswick, Victoria, Horseshoe-nail Manufacturer. Improvements in the motor and in the driving and controlling mechanism of power-propelled vehicles, and in the construction of such vehicles.

Claims.—(1.) In the motor of a power-propelled vehicle, in combination, a cylinder or explosion-chamber A provided with inlet- and exhaust-passages, and with an enlarged pump-chamber A¹ at each end, two trunk-pistons B–B¹, rods C connecting pistons with crank-shafts D and the ignition-gear Y, Y¹, and Y², arranged between the pistons, substantially as described, and shown in Figs. 4 and 5. (2.) In the motor of a power-propelled vehicle, a cylinder as A, having inlet- and outlet-passages, and furnished with electric ignition-gear located between two pistons as B, which work to and from each other, combined with a valve-chest as G, furnished with valves G², G³, and G⁴, for admitting carburetted vapour and air when operated by cams such as F¹ and F², substantially as described, and shown in Figs. 2, 2ª, 4, and 5. (3.) In the motor of a power-propelled vehicle, a cylinder and pump-chamber as A–A¹, provided with a passage in pump-chamber which acts alternately as an induction and eduction air-way, and a trunk-piston as B–B¹ combined with a valve-chest as A³ furnished with non-return valve α and inlet-valve α¹, said chest A³ being connected by pipes with carburetter K and a receiver A⁵, substantially as described and shown. (4.) In the motor of a power-propelled vehicle, a cylinder as A and pump-chamber as A¹, having a communicating passage-way as b² between them, and the cylinder provided with an inlet-passage for the charge of explosive mixture, and exhaust-passages as b¹, combined with the valves G⁴, α², and α³, substantially as described, and shown in Fig. 5ª of the drawings. (5.) In the motor of a power-propelled vehicle, a cylinder as A, provided with inlet- and exhaust-ports, and having a pump-chamber as A¹ at each end in communication with cylinder by passages as b², combined with the trunk-pistons as B–B¹, rods C connected with crank-shafts, valves G⁴, α², and α³, and the ignition-gear, substantially as described, and shown in Fig. 5ª of the drawings. (6.) In power-propelled vehicles, a motor composed of triple cylinders A having enlarged pump-chambers A¹ at each end, and two trunk-pistons as B–B¹ working in said cylinders, rods C connecting the pistons at both ends with a three-throw crank-shaft having crank-discs D² at their ends coupled by rods D¹, one of which latter imparts motion by an arm Y⁹ to crank Y⁸ operating the ignition-gear Y, Y¹, Y², Y⁵, Y⁶, Y⁷, combined with valve-chest G, having valves G² and G³ operated by cams F¹ and F² on shaft F, worked by arms