Oct. 17.] THE NEW ZEALAND GAZETTE. 3103

of molten metals into which a blast is introduced under pressure, a process in which the blast is employed to determine a definite circulation of the metal to and from the surface, for the purposes and substantially as above set forth. (3.) In the manufacture of molten metals under the process described in the first claim, the use of a vessel formed of a bent tube with its inner walls coalescing to form the circumferential base of an upper extension, in combination with means for introducing the blast at or about the base of one of the limbs so formed, for the purposes and as described and illustrated. (4.) In the manufacture of molten metals under the process described in the first claim, the use of a vessel divided by a vertical diaphragm into two chambers communicating at the top and at the bottom, in combination with means for introducing the blast at the base of one chamber, for the purposes and substantially as described and illustrated. (5.) In the manufacture of molten metals under the process described in the first claim, the use of a vessel divided into two compartments by a diaphragm forming two concentric chambers communicating at the top and at the bottom, in combination with means for introducing the blast at or about the base of one chamber, for the purposes and substantially as described and illustrated. (6.) In the manufacture of molten metals under the process described in the first claim, the use of a vessel connected with an external vertical tube at two points at different levels below the level intended for molten liquid, in combination with means for delivering the horizontal blast along the horizontal connection of the tube at the lower level and a vertical blast up the centre of the bottom of the vessel, for the purposes and substantially as described and illustrated. (7.) In the manufacture of molten metals under the process described in the first claim, the use of a vessel consisting of a tube bent round on itself and re-entering at a point below the free surface, in combination with means for introducing the blast at or about the base of one limb, for the purposes and substantially as described. (8.) In the manufacture of molten metals under the process described in the first claim, the introduction of reagent gases or vapours into the circulation, for the purposes and substantially as described. (9.) In the manufacture of molten metals under the process described in the first claim, the exhaustion of the vessel containing the metal immediately after the cessation of the blast, for the purposes and substantially as described. (10.) Vessels for the manufacture of molten metals, constructed, combined, and arranged for the purpose, and substantially as described and illustrated.

(Specification, 10s. ; drawing, 3s.)

No. 23418. — 4th September, 1907. — RICHARD PHILIP MYERS, of 51 Northcote Road, Walthamstow, Essex, England. Improvements in arc lamps.

Claims.—(1.) An arc lamp of the kind in which the movable carbon or carbons is or are controlled by the thermal expansion and contraction of a metal strip, through which the current passes, characterized in that the motion of the free end of said strip (w) controls the operation of a switch whereby the said strip is short-circuited when the expansion thereof exceeds a predetermined amount. (2.) A constructional form of the arc lamp in claim 1, characterized in that a spring (s), which is electrically connected to one end of the strip (w) and which bears one end of a brake-chain (r), is arranged near a contact-piece or tongue (10) which is electrically connected to the other end of the strip (w) in such a manner that when the pull on the said chain due to the expansion of the strip exceeds a predetermined amount the spring (s) will be drawn into contact with the tongue (10), and will thus short-circuit the strip (w). (3.) A constructional form of the arc lamp in claims 1 and 2, characterized in that a stationary contact (11), electrically connected to the insulated carbon of the lamp, is arranged on the side of the tongue (10) remote from the spring (s) in such a manner that the spring (s), after moving into contact with the tongue (10), will press the tongue (10) into contact with the contact-piece (11), and thus short-circuit the lamp in the event of the strip (w) breaking. (4.) The application, to an arc lamp controlled by a main circuit or series wound solenoid, of a switch such as that claimed in claim 1, whereby the said solenoid is short-circuited when the core thereof is attracted beyond a predetermined distance. (5.) A constructional form of the arc lamp in claim 1, characterized in that the strip (w) is attached at its ends by means of eyes and hooks or pins (x, y, z, 3) to a fixed terminal (z) and to the arm (u) of a brake-controlling lever (t, u) respectively, the intermediate part of said strip extending round a pulley (4) rotatably mounted in an adjustable support (5, 6, 7)

so as to permit easy removal and replacement of said strip. (6.) The improved arc lamp, constructed substantially as described with reference to the drawings, for the purposes specified.

(Specification, 8s. ; drawing, 1s.)

No. 23425.—5th September, 1907.—JOHN DELBRIDGE, of 34 Gladstone Street, Windsor, Victoria, Australia, Mining Engineer. Improved air-compressor, usable also as a pump.

Extract from Specification.—In my compressor means are provided for releasing the water without any shock before the piston has completed its travel to each end of compressor, while also means are provided for releasing the air from cylinder immediately it is compressed to the desired pressure and for passing it therefrom to the receiver. The compressor has no delivery-valves and admits air and water, and closes the air and water valves automatically—that is, without any mechanical attachments to the steam-engine or other motive power driving same; further, there are no springs or other gearing required for said valves. Movable internal cushion-ends arranged in the compressor become balanced when the working-pressure therein is reached, and consequently no resistance is offered to the release of air or water. These cushion-ends take the place of delivery-valves, and the circumferential length of compressor will be available for the delivery ports or passages. The free air is admitted into compressor by means of cylindrical valves at bottom thereof, having ports for the admission of air and for the discharge of water, thereby preventing the atmospheric air on entering the cylinder coming into contact with the discharging water. The air-inlet ports to compressor form a reservoir for holding the water forced by a pump or the like into the compressor, and by the air in said ports being expelled it becomes compressed and passes into the receiver, consequently there will be no clearance in this compressor between the piston and the movable cushion-ends, and hence every particle of air is expelled. Provision is also made for slowing down the driving engine automatically when the pressure of air rises beyond the required working-pressure, and further effective means for lubricating the moving parts within the compressor and, if necessary, its driving-engine are provided.

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

(Specification, 17s. 6d. ; drawing, 3s.)

No. 23482.—14th September, 1907.—JOHN HOBBS BEAMISH, of Marine Parade, Ponsonby, Auckland, New Zealand, Architect and Builder. An improved method of glass-roofing.

Claims. — (1.) The shaping the roof with alternative ridge and valley formations, the ridges being covered with clips to hold upper side-edges of panes of glass fitted thereto while resting evenly on sloped upper surface of valley, having gutter resting on upper surface of rafter with clips secured to said rafter and turned over top sides of said gutter, said clips being in part turned over and forming recess to hold lower side-edges of said panes of glass, secondary gutter resting within other gutter, said secondary gutter having clips formed therefrom to receive and hold said panes of glass, and flashing forming part of ridge-pole fitted to hold top edges of said panes of glass in position, for the purpose set forth, as described and illustrated. (2.) The application, arrangement, and combination of the several parts specified, in the manner and for the purpose set forth, as described and illustrated.

(Specification, 3s. 9d. ; drawing, 1s.)

An asterisk (*) denotes the complete specification of an invention for which a provisional specification has been already lodged.

NOTE.—The cost of copying the specification and drawing has been inserted after the notice of each application. An order for a copy or copies should be accompanied by a post-office order or postal note for the cost of copying.

The date of acceptance of each application is given after the number.

Extracts from the drawings accompanying the foregoing complete specifications appear at the end of this Gazette.

J. C. LEWIS,
Registrar.