July 28.] THE NEW ZEALAND GAZETTE. 3029

receptacle, an inner tube within the outer tube, said outer tube being in communication with one end of said conduit and the inner tube of the other end thereof, a head around the upper end of the inner tube and within the outer tube, a stationary inlet-pipe leading to the upper end of the inner tube, and a stuffing-box around said pipe on said outer tube, substantially as described.

[NOTE.—Here follows one other claim.]

(Specification, 6s. 3d.)

No. 27933.—21st June, 1910.—HERBERT PERCY SANDERSON, of Elston Works, Bedford, Bedfordshire, England, Engineer. Improvements in self-propelled vehicles for transport and tractive purposes.

Claims.—(1.) In a self-propelled vehicle for transport and tractive purposes, the arrangement of the main travelling-wheels and the gearing for driving them on a shaft or frame independent of the chassis or main frame upon which the motor and driving mechanism are mounted, substantially as described. (2.) In a self-propelled vehicle or tractor, the arrangement of the main travelling-wheels upon a dead axle carrying brackets forming guides in connection with which corresponding guide-surfaces on the chassis or main frame are free to move, motion being communicated from mechanism mounted upon the main frame to the gearing carried by the brackets on the dead axle through the medium of universal joints, substantially as described, and illustrated in the drawings.

(Specification, 2s. 6d.)

No. 27934.—21st June, 1910.—HERBERT PERCY SANDERSON, of Elston Works, Bedford, Bedfordshire, England, Engineer. Improvements in or connected with differential gearing for motor vehicles.

Claims.—(1.) In differential driving-mechanism for motor-vehicles, wherein the two main driving-wheels are driven from separate concentric shafts, the provision of means for locking the said shafts, substantially as described. (2.) The combination with differential driving-mechanism for motor-vehicles, of mechanism for locking the two shafts of such mechanism, substantially as described, and illustrated in the drawing.

(Specification, 2s. 6d.)

No. 27937.—21st June, 1910.—BENJAMIN SHAW ROBERTS, of 48 Park Street South, Blakenhall, Wolverhampton, Stafford, England, Engineer, and SAMUEL DORSETT, of 158 Dudley Road, Wolverhampton aforesaid, Engineer. Improvements in driving-mechanism of motor-cycles.

Claims.—(1.) In a motor-cycle, the gear between the motor and a power-transmitting wheel which surrounds the axis of the engine-shaft constructed of a sun-and-planet type.

[NOTE.—Here follow eighteen other claims.]

(Specification, 14s.)

No. 27944.—22nd June, 1910.—ALFRED ERWIN SMITH, of Worcester Street, Christchurch, New Zealand, Engineer. Improved apparatus for securing an emergency wheel to the wheel of a vehicle.

Extract from Specification.—A gripping-apparatus, of which a plurality are employed, is permanently fixed to the rim of the spare wheel, and is caused to clamp upon the rim of the main wheel by an eccentric which draws a pair of gripper-claws together.

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

(Specification, 2s. 3d.)

No. 27946.—23rd June, 1910.—EDWIN PHILLIPS, of 264-268 Flinders Street, Melbourne, Victoria, Australia, Patent Attorney and Engineer. Improvements in or relating to variometers for electrical oscillations.

Claims.—(1.) A heavy-current variometer for electrical oscillations, characterized by several partial variometers of equal or approximately equal self-induction being assembled together and connected in series. (2.) A form of the vario-

meter as claimed in claim 1, characterized by its being assembled in such manner that in the position of the greatest self-induction the partial variometers have an inducing action one on another, so that the maximum value is larger than the sum of the self-inductions of the individual partial variometers, whilst in the position of smallest self-induction the partial variometers are so arranged relatively one to another that the total self-induction is approximately equal to the sum of the self-inductions of the partial variometers taken individually.

(Specification, 3s. 9d.)

No. 27947.—23rd June, 1910.—EDWIN PHILLIPS, of 264-268 Flinders Street, Melbourne, Victoria, Australia, Patent Attorney and Engineer. Improvements relating to electric oscillation circuits, particularly adapted for use in wireless telegraphy.

Claims.—(1.) In an electric oscillation circuit, the use of two or more coils which can be put into and out of circuit independently one from another, and one or more of which are arranged to be moved relatively to the other or others in order to enable small adjustments of the self-induction to be made in either direction. (2.) An electric oscillation circuit of the kind described in claim 1, having one coil movably arranged between two coils giving fields in opposite directions.

(Specification, 2s. 9d.)

No. 27955.—22nd June, 1910.—J. P. KARNS TUNNELING-MACHINE COMPANY, a corporation duly organized under the laws of Colorado, with offices at Boulder, Colorado, United States of America (assignees of John Prue Karns, of Johnstown, Pennsylvania, United States of America, Miner). Drilling-machines.

Extract from Specification.—A drilling-head capable of reciprocatory and rotary motion, and designed to continuously drill a bore the full size of the desired tunnel, reciprocatory motion being caused by a suitable shaft from a source of power, and this movement causes a slow step-by-step rotative movement of the cutter-head so that the cutters act continuously on fresh surfaces.

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

(Specification, 19s.)

No. 27956.—22nd June, 1910.—J. P. KARNS TUNNELING-MACHINE COMPANY, a corporation duly organized under the laws of Colorado, with offices at Boulder, Colorado, United States of America (assignees of John Prue Karns, of Johnstown, Pennsylvania, United States of America, Miner). Cutter-heads for drilling-machines.

Extract from Specification.—This invention has reference to improvements for cutter-heads for drilling-machines, and is designed to provide a cutter-head for a drilling-machine of the type wherein there is provided a cutter-head spider carrying on the active face numbers of cutter-blades so arranged as to cut or chip the breast of a tunnel by the bodily movement of the cutter-head toward the said breast of the tunnel, and to reach all portions of the breast of the tunnel by the slow rotative movement of the cutter-head while being reciprocated. In accordance with the present invention, the general structure of the cutter-head is improved, and furthermore there are added trimmers designed to smooth or finish the wall of the tunnel, and these trimmers are carried by the cutter-head and are active on the active stroke of said cutter-head.

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

(Specification, 10s. 9d.)

No. 27960.—22nd June, 1910.—AGNES EDMOND, of Duke Street, Dunedin, Gentlewoman. Improved brooch pins and catches, to minimize loss.

Extract from Specification.—I prefer to make the pins with slight swellings which would come one each side of the usual catch, and I prefer to make the said catch so that it generally or always binds the pin slightly.

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

(Specification, 2s. 3d.)