1326
THE NEW ZEALAND GAZETTE.
[No. 59

No. 12720.—22nd June, 1900.—JOHN YOUNG BUCHANAN, of 27, Nicolson Square, Edinburgh, Scotland, Consulting Chemist. Improvements in or relating to electric cables.

Claims.—(1.) An electric cable comprising a conductor having alternate coatings of guttapercha and a compound of indiarubber and ozokerit, the innermost and outermost of such coatings being of guttapercha. (2.) An electric cable comprising a conductor, a coating of guttapercha round the conductor, a coating of a compound of indiarubber and ozokerit round the guttapercha coating, and another coating of guttapercha round the compound coating, substantially as described.
(Specification, 1s. 9d.; drawings, 3s.)

No. 12721.—22nd June, 1900.—ROBERT KAYE GRAY, of 106, Cannon Street, London, England, Engineer. Improvements in or relating to electric cables.

Claims.—(1.) In an electric cable, the combination with a plastic or semi-plastic insulating covering of means to prevent the flow or displacement of such covering. (2.) In an electric cable, an insulating coating having longitudinal ribs, for the purpose described. (3.) In an electric cable, the combination with a conductor of two or more alternate layers of hard and plastic or semi-plastic insulating material, the hard material being formed with longitudinal ribs, for the purpose described. (4.) In an electric cable, the combination of a conductor, an insulating coating such as B, B¹, of guttapercha round the conductor, a covering of plastic or semi-plastic insulation round the guttapercha coating, and a retaining coating of guttapercha or other material round the plastic or semi-plastic covering, substantially as described.
(Specification, 2s. 6d.; drawings, 3s.)

No. 12722.—22nd June, 1900.—THE NEW TAYTE HOWARD PNEUMATIC TOOL COMPANY, LIMITED, of 63, Queen Victoria Street, London, England, Manufacturers (assignees of Joseph Boyer, of 5334, Maple Avenue, St. Louis, Missouri, United States of America, Manufacturer). Improvements in pneumatic hammers for hand use.

Claims.—(1.) A pneumatic hammer comprising a cylinder, a hammering-piston located therein and having a length of stroke greater than its own length, and a fluid-actuated valve controlling suitable inlet- and exhaust-passages to produce reciprocations of the piston. (2.) A pneumatic hammer comprising a cylinder, a hammering-piston located therein and having a length of stroke greater than its own length, and a valve operated by air compressed by the piston and controlling suitable inlet- and exhaust-passages to produce reciprocations of the piston. (3.) A pneumatic hammer comprising a cylinder, a hammering-piston located therein and having a length of stroke greater than its own length, and a valve composed of two co-operating parts located at the opposite ends of the cylinder and controlling suitable inlet- and exhaust-passages to produce reciprocations of the piston. (4.) A pneumatic hammer comprising a cylinder, a hammering-piston located therein and having a length of stroke greater than its own length, and a valve composed of two co-operating parts located at opposite ends of the cylinder and operated by air compressed by the piston to control suitable inlet- and exhaust-passages to produce reciprocations of the piston. (5.) A pneumatic hammer comprising a cylinder, a hammering-piston located therein, and a valve composed of two annular portions or rings located at opposite ends of the cylinder and controlling suitable inlet- and exhaust-passages to produce reciprocations of the piston. (6.) A pneumatic hammer comprising a cylinder, a hammering-piston located therein, and a valve composed of two annular portions or rings located at opposite ends of the cylinder and operated by air compressed by the piston to control suitable inlet- and exhaust-passages to produce reciprocations of the piston. (7.) A pneumatic hammer comprising a cylinder, a hammering-piston located therein, and a valve composed of two annular portions or rings located in the opposite ends of the piston-chamber in position for the piston to pass through them at the opposite ends of its strokes, and controlling suitable inlet- and exhaust-passages to produce reciprocations of the piston. (8.) A pneumatic hammer comprising a cylinder, a hammering-piston located therein, and a valve composed of two annular portions or rings located in the opposite ends of the piston-chamber and operated by air compressed by the piston and controlling suitable inlet- and exhaust-passages to produce reciprocations of the piston. (9.) A pneumatic hammer comprising a cylinder, a hammering-piston therein, and a co-operating valve composed of two annular portions or rings located at opposite ends of the cylinder and suitably connected to move in unison for the purpose of controlling inlet- and exhaust-passages to produce reciprocations of the piston. (10.) A pneumatic hammer comprising a cylinder, a piston therein, and a co-operating valve composed of two annular portions or rings located in the opposite ends of the piston-chamber and suitably connected to move in unison for the purpose of controlling inlet- and exhaust-passages to produce reciprocations of the piston. (11.) A pneumatic hammer comprising a cylinder, a piston therein, and a co-operating valve composed of two annular portions or rings located at the opposite ends of the cylinder and connected by rods extending longitudinally of the cylinder. (12.) A pneumatic hammer comprising a cylinder, a piston therein, and a co-operating valve composed of two annular portions or rings located in the opposite ends of the piston-chamber and connected by rods passing longitudinally through the cylinder-wall. (13.) A pneumatic hammer comprising a cylinder, a piston therein, and a valve composed of two annular portions or rings located in the opposite ends of the piston-chamber, and connected by rods passing longitudinally through the cylinder-wall, said valve being shifted in opposite directions by air compressed by the piston at the opposite ends of its strokes. (14.) A pneumatic hammer comprising a cylinder, a piston therein, and a valve composed of two annular portions or rings located in the opposite ends of the piston-chamber, and connected by rods passing longitudinally through the cylinder-wall, said valve being shifted in opposite directions by air compressed by the piston at the opposite ends of its strokes, and serving to control the inlet and exhaust of the motive fluid at the opposite ends of the cylinder. (15.) In a pneumatic hammer, the combination of an annular valve located in one end of the piston-chamber, and a piston passing through the valve at the end of its stroke, and shifting the valve by the air compressed in front of the piston. (16.) In a pneumatic hammer, the combination of an annular valve located in one end of the piston-chamber, and a piston passing through the valve at the end of its stroke, and shifting the valve in a direction opposite to the movement of the piston by means of the air compressed in front of the piston. (17.) In a pneumatic hammer, the combination of a valve composed of two co-operating annular portions or rings located in opposite ends of the piston-chamber, and a piston passing through said valve-rings at the opposite ends of its strokes, and shifting them in a direction opposite to its own movement by means of the air compressed in front of it. (18.) In a pneumatic hammer, the combination of a cylinder, a piston therein, and a co-operating annular valve located in position for the piston to pass through it, and having an internal bore closely fitting the piston to prevent the passage of air between them. (19.) In a pneumatic hammer, the combination of a cylinder, a piston therein, and a co-operating valve composed of two annular portions located at opposite ends of the piston-chamber in position for the piston to pass through them at the opposite ends of its strokes, and having internal bores closely fitting the piston to prevent the passage of air between them and the piston. (20.) In a pneumatic hammer, a hammering-piston consisting of a plain cylindrical bolt of uniform diameter throughout its length, in combination with suitable valve-mechanism for controlling the inlet and exhaust of the motive fluid at opposite ends of the piston-chamber to reciprocate the piston. (21.) The combination of the cylinder A having the piston-chamber D and inlet- and exhaust-ports at the opposite ends thereof, the valves (or two-part valve) M, M¹, located in opposite ends of the piston-chamber D and connected by the rods T, T, and the piston E reciprocating in the chamber D and operating at opposite ends of its strokes to shift the valves M, M¹, by means of the air compressed in front of it. (22.) The combination of the cylinder A having the piston-chamber D, and provided with the inlet-passages H and groove I and exhaust-passages L and groove K at its rear end, and the groove I¹ connected by the passage J with the inlet-passage H and the groove K¹ and exhaust-ports L¹ at its front end, the valves (or two-part valve) M, M¹, the former located in the rear end of the piston-chamber and controlling the inlet- and exhaust-grooves I, K, and the latter located in the front end of the piston-chamber and controlling the inlet- and exhaust-grooves I¹, K¹, the rods T, T, interposed between said valves, and the piston E reciprocating in the chamber D and operating to shift the valves M, M¹, at the opposite ends of its strokes by means of the air compressed in front of it. (23.) The combination of the cylinder A having inlet- and exhaust-ports at opposite ends, the valves M, M¹, controlling said ports, the bushing or sleeve N fitted within the cylinder A between the valves M, M¹, and provided with the exterior longitudinal grooves, the wires T, T, located in the said grooves and co-operating at their opposite ends with the valves M, M¹, the strips N¹ inlaid in the said longitudinal grooves and confining the wires T, T, therein, and the piston E reciprocating in the cylinder A (within the bushing N) and operating to shift the valves M, M¹, at the opposite ends of its strokes by the air compressed in front of it. (24.) In a pneumatic hammer, a normally closed throttle-valve located within the cylindrical body of the tool, and opened by the act of pressing the tool to its work, to admit the motive fluid to the tool. (25.) In a pneumatic hammer, the combination