February 26, 1915. THE COLLIERY GUARDIAN. 459 edge, the recess in which the tooth of the sprocket wheel works is not required. Each link is provided with a trans- verse bar at one end, and at the opposite end with a hook for engaging with the bar of the preceding link, and in the recess or aperture in the link in which the tooth of the sprocket wheel ordinarily works is arranged a crossbar, with one or more holes therein for attaching the link and the transverse plates to the endless strips or belts hereinbefore described. One or both longitudinal surfaces of each link is or are made flat, so as to more readily bed itself to the curve of the pulley as the belt works round the same. Eig. 1 block will serve to connect the block to both pipes, but if desired the block can be connected to the pipe flanges by studs instead of bolts. Fig. 1 is a longitudinal central section, and fig. 2 an end elevation of one form of the improved valve. In modifications the passages open into cylindrical or conical recesses. In a further modification LVVJL fl c together, and in a rapidly cooled condition, or, by a modifi- cation of the construction, after subjection to more or less considerable heating. The construction comprises a flue connected with ports at different levels in the wall of the retort, and adapted to be subdivided into two or more collecting chambers, each having its own off-take, or to be used as a single collecting chamber, and situated in such a position relatively to the heating flues of the setting that the products escaping into it are not subjected to any further heating, but are cooled as rapidly as may be. This con- struction alone affords considerable flexibility as compared with the known suggestion of merely collecting the products from different zones separately; since it is possible to collect together the products from two or more zones while in the condition which they have directly they leave the retort, with a result different from that which ensues when the is a side elevation of an elevator belt constructed according to the invention; fig. 2 an end elevation of the same; fig. 3 an enlarged elevation of the front of the belt, showing the method of fixing the links and plates thereto. (Four claims.) 8164 (1914). Improvements in Jockeys or Rope Grips for Mechanical Haulages and the like. J. W. B. Graggs, residing on the property of the Geduld Proprietary Mines Limited, Springs, Transvaal, South Africa.—Relates parti- cularly to jockey or rope-grips of the kind in which a tapered or wedge-shaped gripping path is moved towards or away from a fixed gripping face the said wedge having a longitudinal or endwise movement imparted to it by a slotted lever Which 'acts on a pin on the wedge, and a sideways movement by an inclined guide .against which it works. According to the invention, the slotted lever, wedge, and guide are so mounted that the wedge when moved longi- tudinally by the lever is simultaneously moved by the the cap has the stuffing box formed in its lower part, and it is made with a bridge piece, through which the valve spindle is screwed. (One claim.) 13662 (1914). Improvements in or Relating to Injector Devices Particularly Applicable to Respiratory Apparatus for Use in Unbreathable Atmospheres. J. E. Spickett, of Highmead, Pontypridd, South Wales.—The object is to con- struct a nozzle through which the jet of pressure gas is passed, together with its tubular extension having lateral apertures, as an integral construction, which integral con- struction shall comprise a tubular body, a detachable nipple forming .a continuation thereof, and having the requisite fine bore, and a tubular surrounding sleeve having lateral aper- tures through which gas is drawn in and mixed with the Fig 3 separately collected products are subsequently mixed. In order, however, that the nature of the products may be varied by further cooling or by heating them, the invention also provides flues which can be traversed by cold air or can be heated at will as a whole or in portions to suitable temperature, and are situated alongside the collecting flue, so that the products may be further cooled or heated in any one or all of the chambers into which the collecting flue can be subdivided. This construction having the heating flues is illustrated in the accompanying drawings, in which fig. 1 is a vertical section through the retort; and fig. 2 is a horizontal section on line 2—2 of fig. 1. (Four claims.) inclined guide towards or away from the opposed gripping face in a direction at right angles to the plane of oscillation of the lever. The jockey or grip is provided with a spindle or stem for attaching it to the wagon or truck, and the lever is so mounted that it can be readily actuated by a suitable stop or striking device in the path of its travel to automatic- ally release the grip from the rope. Further, the parts of the jockey or grip are so constructed that they can, when necessary, be renewed by unskilled labour, and such parts are inexpensive to produce; and the jockey can be easily altered and adjusted to adapt it to any size of rope within a comparatively wide range. Fig. 1 is a side elevation of the jockey, and fig. 2 an end elevation of the same. (Eleven claims.) 12454 (1914). An Improved Absorbent Medium for Carbonic Acid Gas. J. Cadman, D.Sc., of 61, Wellington- road, Edgbaston, Warwickshire.—Relates to improvements in media for the elimination or absorption of carbonic acid gas from air, and it is particularly designed for use in connection with breathing apparatus used by persons working in irrespirable atmospheres or under water, and in which the wearer re-breathes his exhaled breath after it has been purified by the elimination of the carbonic acid gas which it contains. To this end a porous vehicle, such as coke, charcoal, or the like, is employed, which by immersion in molten alkali, such as caustic soda or the equivalent, is caused to acquire a coating of the latter in the form of a thin layer, film or skin. In practice it is preferred to employ small lumps of coke which are immersed in molten caustic soda, caustic potash, soda lime, or the like, and allowed to remain therein whilst the latter is kept in motion until -a layer, film, or skin of the alkali has solidified over the surfaces of the lumps. Impure air passed over an absorbent medium as above described is purified by the elimination of the carbonic acid gas it contains without being unduly heated. As a further safeguard against the heating of the air, however, a suitable cooling material, such as calcium chloride, may be added to the carbonic acid absorbent. (Two claims.) 13035 (1914). Improvements in Valves. R. Kilburn and J. Hopkinson and Company Limited, both of Britannia Works, Huddersfield, Yorkshire.—Relates to a novel con- struction of valve of the hind wherein the valve body or casing is made from a solid block of metal, on which there are no flanges, .and which is bored to form the valve chamber, passages being also bored into this valve chamber from the faces of the block to which there are to be con- nected the pipes whose thoroughfare is to be controlled by the valve. According to the invention, in which the block forming the valve body is preferably cut off from a round or other shaped bar or rod, the diameter or contour of whose cross section is the same as that of the pipe flanges to which the valve body is to be connected, holes are drilled longitudinally into or through the block to receive the bolts by which it is connected to the flanges of the pipes on either side of the block. One set of bolts passing through the pressure gas passing through the nozzle, and to so construct the tubular casing by which such integral construction is carried that the said integral construction can be easily removed therefrom when attention is required to clear or change the jet nozzle. Fig. 1 is a vertical section through the nozzle and extension thereof; fig. 2 a vertical section showing the nozzle in elevation and the extension in section ; fig. 3 shows in vertical section the .application of the nozzle to a respiratory apparatus. (Three claims.) 13998 (1914). Improvements in Goal Gutter Picks of the “ Puncher ” Type. H. Hawkins, of 15, Fenwick-street, Pontygwaith, Rhondda; T. G. Jones, of 14, Heath-terrace, Ynyshir, Rhondda; and the Hardy Patent Pick Company Limited, of Mining Tool Works, Heeley, Sheffield.—Cutting picks as ordinarily formed for the “ puncher ” type of coal cutting machine are made detachable from the cutter rods, and have generally five or more prongs splayed out radially, so as to present .a star-shaped group of cutting edges dis- connected from each other except where they commence to splay from the stalk. In order to render “ puncher ” picks more effective, especially when cutting hard coal, they are here arranged with a ring cutting edge or edges around the edge of a deep cut shaped enlarged end of the pick, which gives the cutting edges greater clearance towards the centre of the cavity. These cutting edges taper towards the shank on the outside and taper towards the centre of the bottom of the bowl or cavity on the inside. The cutting edge may be formed of one plain circumferential ring or of two or more rings placed concentric with each other, and deeply sunk around a deep cup shaped recess. Sometimes the edges of such rings, whether single or double, are scalloped, and between the scallops grooves or flutes are sometimes formed. Fig. 1 represents a sectional elevation of a plain ring shaped pick; fig. 2 is a plan view of the same; fig. 3 represents a sectional elevation of a similar pick with two lines of con- centric cutting edges; fig. 4 is a plan view of the same; fig. 5 represents a sectional elevation of a similar pick to that illustrated in fig. 1, with scalloped cutting edges; fig. 6 is an outside elevation of same. (Three claims.) 17667 (1914). Improvements Relating to Vertical Retorts for Carbonising Coal or the like. A. McD. Duckham, of Waseda, Highfield, Ashtead, Surrey. — Relates to a con- struction of vertical retort for carbonising coal or the like, whether for gas making or for coke making, in which the gases and volatile products may be withdrawn from the several zones of the retort and collected either separately or MEW PATENTS CONNECTED WITH THE COAL AND IRON TRADES. Applications for Patents. 2356. Means for intermittently starting and stopping as desired electrical machines. W. Brown. 2358. Cylinders for operating coal and like conveyors of the reciprocating type. S. A. Ward. 2389. Process of alloying zinc with iron or steel. B. F. Dimm. 2392. Synthetic production of ammonia from its elements. H. Wade. (Centrals telle fur Wissenschaftlich- Technische Untersuchungen, Germany.) 2395. Tilting wagons. Naamlooze Vennootschap Con- structiewerkplaatsen voorheen du Croo and Brauns. 2403. Grabs. D. J. Barnard. 2422. Steam engines. E. G. Billings. 2442. Tarpaulin supports for railway vehicles. G. J. Churchward. 2459. Manufacture of ordnance shell bodies and other hollow forgings. F. W. Tannett-Walker. 2460. Iron piling. C. Basel. 2469. Grading or screening material. A. M. Duckham. 2473. Rock drill bits and chucks. F. C. MacDonald, administrator of J. D. MacDonald. 2481. Furnaces. W. W. Crawford. 2483. Pit props and the like. G. J. Coles. 2489. Portable electric lamps. H. J. C. Forrester. (J. W. Dunham, U.S.A.) 2492. Obtaining toluene produced in gas manufacture, and apparatus for use in connection therewith. Hall Motor Fuel Limited, 'and C. B. Tully. 2505. Apparatus for disintegrating solid substances. W. S. Barron and G. S. Barron. 2557. Valves. Bristol Wagon and Carriage Works Limited, and E. C. Coak. 2578. Composition for lining crucibles and the like to with- stand intense heat. J; B. Sidebottom. 2579. Pumps. C. H. Adams. 2617. Prevention of the deposition of slag in furnaces. R. Grabowsky. 2621. Hearth furnaces for melting metals. E. Bosshardt. 2630. Igniters for use with safety fuses to explode blasting charges or the like. W. F. Bennett. 2639. Treating iron 'and steel ingots. B. Talbot. 2653. Air pumps. W. E. Miller and T. H. Roberts. 2664. Lifting jack for derailed colliery trams. W. Browning. 2673. Steam condensers. Contraflo Condenser and Kinetic Air Pump Company Limited, and C. F. Higgins. 2674. Steam turbine condensing plant. Contraflo Condenser and Kinetic Air Pump Company Limited, and C. F. Higgins. 2686. Jointing of tramway and railway rails by fish plates. H. F. Kerr. 2702. Rotary pumps and motors. H. S. Hele-Shaw and F. L. Martineau. 2718. Tool for cutting coal, rock, and the like. B. Cribbin. and G. W. Cribbin. 2733. Metal moulds for casting. F. A. Mitchell. 2736. Machines for breaking coal or other friable material. B. Norton. 2757. Steam valves for direct-acting pumps. D. Galloway. 2768. Gas purifiers. R. J. Milbourne. 2769. Washing, scrubbing, purifying, and condensing apparatus employed in the manufacture of gas. H. Pooley and G. B. Fiddes.