424
THE NEW ZEALAND GAZETTE.
[No. 15

scribed, and illustrated in the drawings. (2.) In a hair-pin, a leg having a series of kinks, as shown by Fig. 2, and a straight leg of greater length than the bent leg, substantially as and for the purposes described, and illustrated in the drawings. (3.) In a hair-pin, a leg having a curve, kinks, and straight lengths separating the kinks, and a straight leg of greater length than the bent leg, substantially as and for the purposes described, and illustrated in the drawings. (4.) The improvements in hair-pins constructed, arranged, and combined substantially as and for the purposes described, and illustrated in the drawings.
(Specification, 1s. 6d.; drawings, 3s.)

No. 12370.—8th February, 1900.—WILLIAM HENRY GOODWIN, of 120, Victoria Street, Toronto, Canada, Chart-compiler. Improvements in chart-blanks.

Extract from Specification.—This invention is particularly adapted for the production of chronological charts. The invention may be briefly described as consisting of a quadrantal chart-blank, having one or more scales at one or both of the edges radiating from one corner thereof, and a graduated arc extending from one of said radial edges to the other.

Claims.—(1.) A quadrantal chart-blank having one or more radial scales at the radial edge or edges thereof, substantially as described, and for the purpose set forth. (2.) A quadrantal chart-blank having one or more radial scales at the radial edge or edges thereof, and a graduated arc, substantially as described, and for the purpose set forth.
(Specification, 1s. 9d.; drawings, 3s.)

No. 12371.—8th February, 1900.—CHARLES HAVELOCK TAYLOR, of 57, Clandeboye Avenue, Westmount, Montreal, Canada, Mechanical Engineer. Improvements in rotary engines.

Claims.—(1.) In a rotary engine, the combination with a cylinder, and a part to be driven, of means for forming a series of spiral chambers within said cylinder, means for operatively connecting said chambers to the part to be driven—said spiral chambers being of progressively increasing capacity from the fluid-intake port of said cylinder to the exhaust-port thereof, and means for causing said fluid to pass successively through said chambers, for the purpose set forth. (2.) In a rotary engine, the combination with a cylinder, and a part to be driven, of means for forming a series of spiral chambers within said cylinder, means for operatively connecting said chambers to the part to be driven—said spiral chambers being of increasing capacity from one end thereof to the other, means for supplying an expansible fluid direct to several of said chambers, means for automatically decreasing or increasing the number of said supplies, and means for causing said fluid to pass successively through all of said chambers, for the purpose set forth. (3.) In a rotary engine, a cylinder, a spiral piston located within said cylinder, and increasing in diameter from one end to the other, said cylinder closely fitting the periphery of said piston; an exhaust-port from said cylinder at the end of greatest diameter; means for supplying steam to said cylinder at points of different diameter along said spiral piston; and means for automatically decreasing or increasing the number of points to which steam is supplied, for the purpose set forth. (4.) In a rotary engine, a cylinder, a shaft extending through said cylinder, a spiral vane formed integrally with and entwined about said shaft from end to end of the portion thereof within said cylinder—said cylinder corresponding in form to and fitting closely the periphery of said vane, supply- and exhaust-ports to and from said cylinder and located respectively at the opposite ends thereof; the spiral space formed by said vane, the surface of said shaft, and the inside face of said cylinder increasing in capacity from the supply end to the exhaust end thereof; a series of diaphragms adapted to intermesh with said vane and completely bisect the spaces between the convolutions thereof; means for carrying said diaphragm, and means for causing same to travel axially of said shaft during the revolution thereof, for the purpose set forth. (5.) In a rotary engine, a cylinder, a concavo-conoidal shaft extending through said cylinder, a spiral vane formed integrally with and entwined about said shaft from end to end of the portion thereof within said cylinder—said cylinder corresponding in form to and fitting closely the periphery of said vane, supply- and exhaust-ports to and from said cylinder, and located respectively at the ends of minimum and maximum diameter thereof, a circular box extending laterally in an axial plane from said cylinder, a hub mounted rotatably within said box, a series of diaphragms adapted to completely bisect the spaces between the convolutions of said vane, and means for yieldingly connecting said diaphragm radially to the periphery of said hub, and means for packing the line of juncture of said box and cylinder and the points at which said diaphragms intersect said line of juncture, for the purpose set forth. (6.) In a rotary engine, a cylinder, a concavo-conoidal shaft extending through said cylinder, a spiral vane formed integrally with and entwined about said shaft from end to end of the portion thereof within said cylinder—said cylinder corresponding in form to and fitting closely the periphery of said vane, supply- and exhaust-ports to and from said cylinder and located respectively at the ends of minimum and maximum diameter thereof; a circular box extending laterally in an axial plane from said cylinder, a hub mounted rotatably within said box and having a series of radial borings formed in the periphery thereof; a series of tapered wedge-shaped resistance-heads 62, each formed with a plug 67 adapted to take into said borings, said resistance-heads being adapted to completely bisect the space between the pair of convolutions adjacent thereto of the vane; a series of coiled springs adapted to take over said plugs and bear between said resistance-heads and the hub, and means for packing the line of juncture of said box and cylinder and the points at which said diaphragms intersect said line of juncture, for the purpose set forth. (7.) In a rotary engine, a cylinder, a concavo-conoidal shaft extending through said cylinder, a spiral vane formed integrally with and entwined about said shaft from end to end of the portion thereof within said cylinder—said cylinder corresponding in form to and fitting closely the periphery of said vane, supply- and exhaust-ports to and from said cylinder and located respectively at the ends of minimum and maximum diameter thereof, a circular box extending laterally in an axial plane from said cylinder, a pair of sleeves formed in one with and extending axially in opposite directions from the exterior of said box, a hub mounted rotatably within said box and having a series of radial borings formed in the periphery thereof; a series of tapered wedge-shaped resistance-heads 62, each formed with a plug 67 adapted to take into said borings, said resistance-heads being adapted to completely bisect the space between the pair of convolutions adjacent thereto of the vane; a series of coiled springs adapted to take over said plugs, and bear between said resistance-heads and the hub; a series of packing-pins located in registering grooves in the adjoining edges of said resistance-heads, a pair of pins located respectively in contact with each side edge of each head; said hub being formed with oppositely extending sleeves adapted to take into said before-mentioned sleeves, a spindle passing through said sleeves and enlarged and screw-threaded at one end to take into the screw-threaded interior of one end of the outer sleeves, the exterior of the adjacent inner sleeve being circumferentially grooved; and a series of packing-rings L-shaped in cross-section encircling said sleeve and taking into the grooves thereof; substantially as described and for the purpose set forth. (8.) An automatic cut-off device comprising a casing 72, formed with a cylindrical valve-chamber 73; a steam-supply to the upper end of said valve-chamber; a series of channels 75, 76, 77, and 78, communicating with the cylinder of the engine, and each communicating independently with the valve-chamber 73 at a different point along the length thereof; a tray 178, supported a short distance beneath the lower end of said valve-chamber; a valve 90 of hollow cylindrical form slidable within and longitudinally of said valve-chamber; and means under control of a moving part of the engine for sliding said valve to cut off the steam-supply to said channels as the speed of said moving part becomes excessive. (9.) A governor for automatically actuating a cut-off device, consisting of a slidable stem 93, formed at its upper end with a rack 95, a rotatable bracket 96, a pair of toothed segments 97 pivoted to said bracket and intermeshing with said rack 95, a pair of rods 98 connected rigidly at their inner ends to said racks and carrying governor-balls 99 at their outer ends, and a pulley 100 mounted rigidly upon said bracket 96, as described and shown.
(Specification, 16s. 9d.; drawings, £2 11s.)

No. 12373.—8th February, 1900.—WILLIAM JAMES DAVY, of 52, Durham Road, East Finchley, Middlesex, England, Engineer, and CHARLES WILLIAMSON MILNE, of 3 and 5, Crown Court, Old Broad Street, London, England, Gentleman. Improvements in electric arc-lamps.

Claims.—(1.) In an enclosed arc-lamp in which the carbon tends to feed forwards, the feed-mechanism chamber closed at its ends, a transparent enclosing bell bearing against one end of the chamber, a carbon passing through this end of the chamber into the enclosing bell, a disc fitting loosely in the mechanism-chamber and having a hole through which the carbon passes freely, a regulating-rod loosely attached to the disc near its periphery, a stop adapted to limit the motion of the disc at an opposite point of the periphery, and a means for determining the position of the rod according to the resistance of the arc. (2.) An enclosed electric arc-lamp con-