198 THE COLLIERY GUARDIAN January 22, 1915. vehicle axles, said arms or the like being retracted or released at the end of the movement by suitable cams. In connection with 'the projecting arms means may be also provided whereby the vehicle may travel in a reverse direc- tion without operating or fouling the apparatus. The oil delivery plungers or the like are provided with yielding devices whereby the usual oil valves in the wheel and plungers are maintained in exact alignment during the transverse movement of the oil delivery plungers. Suitable relief valves are provided to release the pressure of the oil at the end of the forward stroke of the reciprocating frame. Tig. 1 is a part sectional end elevation, and fig. 2 is a part- sectional plan. (Five claims.) 27886 (1913). Improved Ratchet Device for Rock Drills and, like purposes. J. E. Brown, of 74, Psalter-lane, Shef- field.—Relates to an improved arrangement of parts or mechanism which constitute a ratchet lever for operating in connection with hand worked rock drilling machines of the type in general use and for other like purposes. Fig. 1 repre- sents a rear elevation of the outer casing; fig. 2, side eleva- tion ; fig. 3, the rear part of nozzle removed from the casing ; fig. 4, plan of interior of casing showing ratchet teeth and position of pawls. In its application to a hand worked rock boring machine, it consists of an outer casing A with an outside short tubular socket B for the insertion of a hand lever C, by means of which an intermittent rotary motion may be applied, but other equivalent means may be used to accomplish this action. Within the casing and integral with it is a circle of ratchet teeth D, for example, five as shown, and they are of considerable depth so as to enable them to engage with two pawls E carried one above the other. These pawls are preferably cylindrical, each end being similarly shaped for engagement with the ratchet teeth; they are adapted to slide within holes bored cross- wise relatively to each other, through the back part F of the head of the feed screw G and drill socket K, and are located one above the other as shown in fig. 3. The pawls are caused to slide to and fro within the holes and to project from one side or the other of the part F by the rotary action of the casing in conjunction with the inclined backs II of the teeth, so that when the lever is moved in one direction the pawls, as is usual in ratchet drills, ride over the backs of the teeth, and in the working direction they engage with the flat face of the teeth and turn the boring tool or drill. The object of using two pawls is to reduce the amount of what would otherwise be inoperative or waste movement of the lever, and also to enable large size teeth to be employed. When the parts are assembled the casing is secured in posi- tion upon the head part by means of a pin J passed through the casing and engaging within an annular groove I, fig. 3, formed in the part F, which allows the casing to be rotated, but prevents its escape. (Two claims.) NEW PATENTS CONNECTED WITH THE COAL AND IRON TRADES. Applications for Patents. 416. Portable lamps. E. A. Hailwood. 431. Manufacture of insulating material. Soc. Anon des Combustibles Industriels. 463. Metal roofing sheets. G-. W. B. Lewis. 472. Process of and apparatus for washing and treating coal. C. Burnett. 481. Fuel economisers for steam boilers. F. Eddleston. 487. Pumps. J. C. Merry weather. 489. Means for supporting and joining the ends of rail- way rails. W. R. Arnold. 491. Electric motor control systems. British Thomson- Houston Company Limited. (General Electric Company, U.S.A.) 502. Valves for controlling the supply of fluid under pressure. S. C. Davidson. 512. Burners for liquid or pulverulent fuels. S. F. Stackard. 530. Jigs for use in connection with drilling machines. W. A. Webb. 535. Winding, sinking, and hauling engines. J. Richard- son. 556. Crushing, grinding, and pulverising machines. W. H. Coward. 566 and 567. Manufacture of explosives. W. H. Palmer, and Palmer-Perchlorate Powder Company of Canada Limited. 571. Furnaces. C. Edmeston, senr. 579. Drilling, boring, and like machines. A. Smith and T. Metcalfe. 599. Machines for cutting off the ends of rolled bars. Fried. Krupp Akt.-Ges. 632. Treatment of hydrocarbons of the coal tar series or the like for the obtainment of products therefrom. E. A. Ashcroft. 643. Jigging conveyors. J. Jackson, S. Greenhalgh, and A. Robertson. 666. Cooling towers. Fritz Uhde. 682. Mining machines. R. J. Tugwood. (Jeffery Manu- facturing Company.) 685. Manufacture of explosives. A. W. Jackson and J. C. Blanch. 705. Incline safety catch for vehicles. E, Hutt. 717. Protection of electric cables. J. H. Bowden and H. F. J. Thompson. 729. Distilling shale, lignite, coal, and the like, and the treatment of the distilled vapours. 0. D. Lucas. 735. Crushing, grinding, and pulverising machines. W. H. Coward. Complete Specifications Accepted. (To be published on February 4.) 1913. 22654. Means for preventing dust particles escaping from boreholes in mines. Alderson. 28751. Grabs. Savon. 1914. 768. Axle and the like bearings. Bursell. 1024. Automatic coupling for railway wagons and like vehicles. Crossley. (Ettenger.) 1025. Apparatus for coupling and uncoupling railway wagon buffers. Crossley. (Ettenger.) 1188. Manufacture of briquettes and apparatus therefor. Armstrong. 1937. Steam and other elastic fluid turbines. Bonom. 3899. Production of oils or spirits for use in internal com- bustion engines. Jenkins. 6824. Belts for elevating, conveying, and other machines. 11029. Centrifugal fans. Stott. 11172. Driving of rolling mills and other machinery. Marsden. 11279. Chucks or sockets for rock boring drills and the like. Hardy Patent Pick Company, and Cribbin. 13930. Process of, and apparatus for, purifying gaseous fluids by means of a centrifugal fan or centrifugal com- pressor. Soc. d’Exploitation des Appareils Rateau. 17668. Apparatus for discharging vertical retorts for car- bonising coal or the like. Duckham. Complete Specifications Open to Public Inspection Before Acceptance. 1914. 15368. Separation of volatile products from solid carbona- ceous material. Oil and Carbon Products. 15381. Screw conveyors. Oil and Carbon Products. 16384. Process of distilling residues of mineral oil and apparatus therefor. Sumpf. 1915. 210. Apparatus for delivering and compressing gases and fluids. Wegmann. CAPTURING ENEMY PATENTS. The following list of British Patents which have been granted in favour of residents of Germany, Austria, or Hungary, is furnished in view of the new Patents Acts, which empower the Board of Trade to confer upon British subjects the right to manufacture under enemy patents, and is specially compiled for the Colliery Guardian by Lewis Wm. Goold, Chartered Patent Agent, 5, Corporation-street, Birmingham. It is desirable in the first instance to obtain the latest particulars upon the Register of Patents. If any patent listed has been assigned to a non-enemy proprietor, the law does not apply. 2944/12. Coke oven and like doors. A door bevelled along its closing edge to fit a correspondingly bevelled seating in the frame is provided with packing seated in grooves formed in the door or in the frame. H. J. Limberg, Germany (dated February 4, 1911). 2965/12. Coke ovens. In a coke oven heated by vertical flues in the side walls, having burners at their lower ends, the gas supply to the burners is led first to the middle of the oven, and is dis- tributed thence through one or more chambers so arranged that the gas for the end burners is heated more than that for the burners at the middle of the oven. The gas may be supplied from both ends, or from one end only. F. Collin, Germany (dated February 28, 1911). 2972/12. Impregnating wood. In the impregnation of wood with solution of preservative salts, such as zinc chloride and aluminium sulphate, a small portion of chromic acid or its salts is added to the impregnating liquid, for the purpose of fixing the salts in the wood. Dr. Conway, Baron von Girsewald, Berlin, and H. Bruning, Germany. 3022/12. Railway vehicles; axle trucks. W. Schellerich, Bohemia. 3041/12. Furnaces; charging. A charging hopper for gas generators, blastfurnaces, shaft kilns, etc., has a ridge section annular ring or bell, and a central bell or closure operated so as to distribute the fuel centrally or circumferentially. Ges. fur Gasfeuerungs-Technik (Kerpely-Patente), Ger- many (dated February 28, 1911). 3117/12. Electric motor control systems. R. Richter, Ger- many, and Maffei-Schwartzkopff-Werke, Berlin (dated April 21, 1911). 3239/12. Steam engines; hand, foot, and like gear; start- ing engine. K. Mobus, Germany (dated April 5, 1911). 3242/12. Hoppers. The curved gate or shutter of the dis- charge spout of a hopper is pivoted above the floor of the spout, and is swung downwards through a gap in the floor to open the spout, the flattened upper or forward part of the gate then forming a closure bridging the gap. A. Fried- rich, Berlin. 3480/12. Lifting, etc.; depth indicators. In winding systems in which two cages are used, one ascending as the other descends, a depth indi- cator is driven through differential gearing from two head sheaves over which the ropes con- nected to the two cages pass. The revolutions of the indicator shaft thus equal the sum of the revolutions of the two head sheaves. This is stated to avoid accumulative errors which arise when only one sheave is used to drive the indi- cator, and are caused by the loaded rope creeping over its sheave. Safety devices, such as means for preventing overwinding, may be operated by the indicator. Siemens-Schuckertwerke, Berlin (dated February 10, 1911). 3525/12. Centrifugal fans and pumps. F. Lawaczeck and Aberzener Maschinenfabrik-Ges., Germany. Copies of any of the above specifications can be supplied at the price of Is. post free. GOVERNMENT PUBLICATIONS. *** Any of the following publications may be obtained on application to this office at the price named post free. Census Returns, 1911 : County of Stafford, Is. 4d.; Car- digan, Merioneth, and Montgomery, Is. 0|d.; Glamorgan, Is.; Somerset, lid.; Suffolk, lid. Consular Reports, 1913 : Mauritius, 5d.; Grenada, 2Jd. Annual Statement of Trade for 1913 : Supplements to Vols. 1 and 2, 3s. 7d. Tramways and Light Railways (Street and Road) and Trackless Trolley Undertakings Return for 1913, 8Jd. Boiler Explosion Reports : (No. 2337), at the Briton Ferry Copper Works, 2Jd.; (No. 2336), Cast Iron Steam Heated Chest at Alston Works, Bradford, 2|d. Statutory Rules and Orders : (No. 1863), Income-Tax Regulations, ljd. Inspector of Foods Report for 1913-14, 2Jd. State of Unemployment in December, 1914, Report, 2d. Housing and Town Planning Memorandum, No. 4, 2d. PUBLICATIONS RECEIVED. The “ Gas World ” Year Book, 1915. London : The Gas World. Price, 7s. 6d. Reports on Cases Decided by the Railway and Canal Commissioners. Vol. XV. By Ralph Neville and W. A. Robertson. London : Sweet and Maxwell Limited. Price, .£1 17s. 6d. net. “ Bulletin of the American Institute of Mining Engineers,” January; “Records of the Geological Survey of India” (Vol. 44, Part 5), price 1 rupee; “The Journal of the Chemical, Metallurgical, and Mining Survey of South Africa ” (Vol. 15, No. 5), November, price 3s.; “ Bulletin of the Institution of Mining and Metallurgy ” (No. 124); “ Journal of the Franklin Institute ” (Vol. 179, No. 1), January, price 50c. ; “ Transactions of the Institution of Engineers and Shipbuilders in Scotland,” January (Vol. 58, Part 3); “Transactions of the Manchester Geological and Mining Society, Contents and Index, Sessions 1912-13 and 1913-14.” CATALOGUES AND PRICE LISTS RECEIVED. Messrs. Bruce Peebles and Company Limited (Edinburgh) send us their latest motor converter pamphlet. Simple explanatory diagrams are to be found in its pages, together with characteristic curves, both for lighting and traction sets. An interesting comparison is given of motor converters with rotaries and motor generators. Messrs. J. H. Tucker and Company (King’s-road, Hay Mills, Birmingham) send us a leaflet describing their latest Ironclad switch, which possesses some novel features. In addition to the more usual quick “ break,” it is also fitted with a quick “ make ” movement. Only micanite is used for insulating purposes, and the switch is subjected to a flash test of 2,000 volts. Every case is fitted with an earthing terminal of the size recommended by the I.E.E. The interiors are coated with a special silicate enamel, while the exteriors are enamelled and stoved to a hard and high-class finish. The switch is being produced in the 25 ampere size only, at the moment, but other sizes are stated to be on the way. A new application of surface combustion is detailed in a pamphlet which has been sent to us by the Bonecourt Waste Heat Boiler Company Limited (Parliament-mansions, S.W.). The Bonecourt waste heat boiler has been designed for the purpose of raising steam • or heating water by utilising the waste heat of the exhaust gases of internal combustion engines or industrial furnaces. Working in conjunction with a suction producer gas engine plant, the boiler is stated to have evaporated on test 2-8 lb. of steam from and at 212 degs. Fahr, per hour per lb. of coke, and in conjunction with an oil engine 3-5 lb. per b.h.p. per hour. Boilers have been designed to work with gas engines of from 2,000 to 25 b.h.p. A combined waste heat and fuel- fired boiler can be supplied where it is necessary to generate steam when the engine is not in use. In the case of metal- lurgical furnaces, it is claimed that the percentage of heat utilised may be increased from 27 per cent, to 50 per cent, by the use of these boilers. Messrs. J. H. Holmes and Company (Newcastle-on-Tyne) issue a leaflet relating to their Ironclad oil break switchgear for mining and substation work. This gear has been evolved to meet the demand for Ironclad switch units of more moderate breaking capacity than that previously listed. Solid cast iron cases, with electrically welded steel tanks in stout metal, and tripping gear of unusual stability have been incorporated, and the gear is capable of dealing with much greater disturbances than is usually expected of this type; at the same time, economy of space has had due considera- tion. The “ draw out ” type of oil switch, mounted on tubular carriage ways, with inter-locked handle gear, has been adopted, giving mistake and accident proof isolating system. Dust-tight shutters are provided when used on high-tension circuits in mines. Any combination of trip gear, with leakage trips and .indicators, may be fitted as required. The maximum voltage intended for use is 3,300 volts. The switches may be provided for a normal capacity of 150 amperes at 3,300 volts, or up to 300 amperes at 650 volts. The gears may be coupled together to form distribu- tion boards, with ammeters, voltmeters, or wattmeters as desired. Several objections have been raised to the scheme of the London County Council for constituting a new authority to supply electric energy in the administrative County of London and adjoining areas. The Poplar Borough Council has found a new one, arising out of the war. In a report, severely criticising the scheme, drawn up by the electricity committee of the borough council, the vulnerability of one large generating station in time of war is pointed out. It is further suggested that there is more security against breakdown or labour troubles in a multiplicity of under- takings than in one central electricity authority. Mr. G. H. Hume, chairman of the Special Electricity Committee of the London County Council, states that it was not contemplated to shut down at once all the existing sources of electric energy. The scheme would be evolutionary in its development. The idea was the gradual establishment of two large generating stations one on each side of the Thames, from which supplies in bulk would be given to existing undertakings, and also the gradual combination of the latter, so as eventually to bring about one unified scheme.