1000 THE COLLIERY GUARDIAN November 12, 1915. from the dynamo increases (due to the engine speeding up) and becomes strong enough to operate the contact of the relay e2, the local circuit for the resetting coils is broken, and remains so while the dynamo is running, after which the relay contacts resume their normal positions. This allows of a fresh signal being given during the wind. According to another more complete arrangement, a series of “ operating ” coils and a series of “ locking coils ” are provided. The locking coils are in circuit with the contacts of signal cancelling relays, while the operating coils are in circuit with those of the signalling relays, said locking coils also being in circuit with the contacts of “ time lag ” cancellation relays. (Ten claims.) 20276 (1914). A Cooling Device in connection with the Ascension and Dip Pipes of Gas Furnaces. B. E. D. Kilburn, of Chancery-lane Station Chambers, High Holbom, London, W.C. (A communication from M. de Jongh and I. A. Pacchioni, both of Rome, Italy.) — Relates to a cooling device in connection with the ascension and dip pipes of gas furnaces, and has particular reference to furnaces in which the gas, on its way from the rising or ascension pipe to the hydraulic main or tar receiver, passes through a pipe which is cooled by a water jacket, such pipe often being furnished with removable covers to allow of access for cleaning pur- poses. According to the invention, between the upper end of each rising pipe and the tar receiver, a U-shaped gas passage pipe is provided, the two limbs of which are separated by a partition, and are enclosed in a jacket through * which the cooling water is circulated. The limbs are rendered easily accessible at their upper ends, as well as at their lower ends, by means of removable cleaning covers, so that although efficient cooling and consequently thorough separation of the tarry ingredients of the gas is ensured owing to the compara- tively long path which the gas had to travel, each single portion of the jacketed gas passage pipe can be easily inspected, and, if necessary, cleaned. In some cases more than one U-shaped pipe may be employed, or it may consist of several turns. The gas outlet pipe, whatever be its shape and length, is connected to the corresponding hydraulic valve. All the valves of each furnace (each furnace has any desired number of chambers, each with a valve of its own) are mounted in a joint tank (tar condenser) of any desired shape, provided with lateral cleaning openings. This tank is con- nected by a pipe and a valve to the gas collecting conduit. The construction illustrated in the accompanying drawings in fig. 1 in section enables the following objects to be attained in a simple and efficient manner :—(1) Strong cooling of the gas at the escape from the distilling or gasifying chamber; (2) separation of the thick tar from the dust and other particles mechanically carried away by the gas; (3) complete inde- pendence of one furnace chamber from the other chambers of the same furnace during the processes taking place in the said chamber (emptying, loading, removal of slag, repairing, etc.); (4) possibility of carrying out the distillation with a perfectly reliable and easily observed hydraulic seal; (5) perfect accessibility of the parts through which the gas passes before entering the gas collecting conduit; (6) complete avoid- ance of any possible circulation of gas between the rising pipes and the distilling chamber. (Two claims.) 22097 (1914). Improvements in Trip Gear for Corliss Valves. J. Taylor, of Soho Iron Works, Heywood, Lanca- shire.—Relates to radial trip gear for Corliss and other valves with a trip piece having a rectilinear movement radial with the valve spindle. It is designed to provide a trip ng.2 gear having a square or straight lift on the trip piece whereby the wear on the tw’o wearing edges and the liability of slipping are reduced to a minimum, and the engagement of the parts rendered more certain, especially suitable for quick running engines. Fig. 1 is side elevation with parts shown in section on line y—y fig. 2; fig. 2 a transverse section on line x—x fig. 1; fig. 3 a sectional eleva- tion on line z—z fig. 2; and fig. 4 a perspective view of the trip piece D, tappets E E1, and quadrant bracket G. The operating disc or lever A is mounted upon the valve spindle B, and is caused to oscillate around it in the usual way, and the valve lever C by which the valve spindle B is oscillated or rocked, is keyed to the latter by a key c. The operating disc lever A carries at its upper end a trip gear case a in the form of a box or bracket, in which is fitted a sliding trip piece D with a rectilinear movement, giving a straight or square lift radial to the valve spindle B and valve lever C. The trip piece D is forced into contact with the face of the valve lever C by a spring dl and pin d2 the pressure of the spring being regulated and adjusted by a guide screw d3 passing through a cross bar a2 fitted to the top of the gear case. The ends d of the trip piece D project laterally through slots a1 in the sides of the trip gear case a, and rest upon tappets E E1, by which the trip piece is raised, against the pressure of the spring d1, out of engagement with the valve lever C, the tappets being mounted on a transverse spindle el passing through the gear case a to rock simultaneously. The tappet E is made with a depending member e by which it is actuated. Adjacent to it a stud or runner g is mounted on a quadrant bracket G, over which it rides at each stroke of the operating disc lever A to raise the trip piece D to release the valve lever C. The member e of the tappet E is fitted with a stud or side lug e2, which rests upon the quadrant bracket G when the tappet is drawn back off the runner g to prevent it falling. The face of the valve lever C is fitted with a renewable wearing piece c1, with which the trip piece D engages. The adjusting guide screw d3 is preferably hollow with pin d2 sliding therein, the spring d1 being compressed between the end of the screw and the head of the pin. An auxiliary stud A1 may be affixed to the bottom of the operating disc or lever A to engage the valve lever C in case of accident, and ensure the closing movement of the valve spindle B. (Three claims.) 24109 (1914). A Debris Removing Device for Percussive Rock Drills. G. Mairet, 40, Mincing-lane, London, E.C., and Blythwood, Bourne-hill, Palmers Green, Middlesex.— Relates to rock drills of the kind in which the detritus pro- duced by drilling is removed by the exhaust fluid, which passes through unthrottled scavenge channels to the hollow bit. A chamber is provided into which the exhaust ports, scavenge channels and exhaust throttle communicate, and is so arranged that by a partial or total closing of the said 6 j throttle a current of motive fluid controllable in force, but always having a free passage of maximum section, passes down into the drill bit. Fig. 1 is an elevation partly in section of the hammer drill; and fig. 2 illustrates in section a part of a slightly modified construction of drill. (Three claims.) MEW PATEMTS CONNECTED WITH THE COAL AND IRON TRADES. Applications for Patents. 15339. Grease injector for motor-cars and other machinery. G. W. Samuelson. 15344. Gas furnaces. A. J. Miller. 15346. Mode of and means for firing, hardening, or temper- ing. I. Hall. 15350. Apparatus for screening granular or pulverulent materials. R. M. Buchanan. 15362. Tool for cutting wires and steel or iron sheets. A. Farley. 15395. Flexible shaft or chain. O. Ohlson. 15401. Mechanical lubricating apparatus for automatically lubricating the parts of locomotive and other engines and machines. J. Thomas. 15405. Manufacture of various refractory substances for use as fuel, and the method of using same. W. Sharp. 15415. Adjustable lock nut. A. E. Davies and A. G. Davies. 15421. Electro-magnetic power transmission and conversion system. J. Dollard and H. W. Brown. 15426. Pressing cage or strainer in presses used for the pro- duction of naphthalene. J. E. Weyman. 15427. Electric coupling appliances. J. B. Mclndoe. 15462. Metal melting furnaces. J. D. Paton. 15467. Gas producers. A. H. Lymn, L. A. Riley, and N. E. Rambush. 15468. Storage vessels for compressed air and other fluids under pressure. W. R. Renshaw. 15485. Fire lighter. H. G. Blain. 15486. Coupling for compressed air, vacuum, or the like pipes. R. J. Houghton. 15491. Liquid fuel burner. F. A. Byrne. 15492. Depth indicators and the like. C. M. Dorman, R. A. Smith, and H. G. Baggs. 15498. Safety cage for the purpose of holding a lamp or light of any description in safety, and to prevent the upsetting of same. W. H. Edmunds. 15514. Pumps. British Thomson - Houston Company Limited. 15525. Means for compensating for leakage in wave trans- mission systems. G. Constantinesco and W. Haddon. 15529. Facing, recessing, and counter-sinking tool, for use in drilling, boring, or similar machines. G. Bilham. 15531. Fire lighter. G. P. Holland. 15535. Signalling appliances for collieries and the like. J. Neil. 15537. Tipping bodies for vehicles. J. R. Churchill. 15561. Attachment or tool for cutting wire, cable, rope, rod, or the like. F. Humphris. 15570. Tools for boring in coal, stone, or like substances. B. Cribbin and C. Horn. 15581. Apparatus for projecting ignited, fire extinguishing, or disinfecting liquids. J. Hersent, G. Hersent, and J. A. Thirion. 15585. Gas producers. J. Y. Johnson. 15588. Manufacture of weldless couplings for railway wagons. Weldless Couplings Limited, and I. H. Pilot. 15600. Manufacture of fuses, fuse plugs, friction tubes, and articles of a similar nature. S. S. Walker. 15601. Means for locking nuts and the like on bolts. H. G. Cameron. 15608. Twist drills and like metal cutting or boring tools. J. Wing and B. O’Reilly. 15611. Elastic fluid engine, pump, compressor, or the like. W. H. Seddon. 15645. Classification, concentration, and separation of ores, minerals, clays, alluvial deposits, or other loose fragmentary, granular, or pulverulent material, and apparatus therefor. B. Waites and M. Waites. 15651. Driving apparatus for shaker conveyors. H. C. Jenkins and E. Ellacott. 15656. Production of iron alloys. E. C. R. Marks. 15709. Combined stand and shield, specially adapted for use in conjunction with artificial fuel blocks. A. C- B. Webb. 15717. Gas producer. P. B. Morgan. Complete Specifications Accepted. (To be published on November 25.) 1914. 5218. Process for the preparation of pure peat or turf and the article produced. Von Ruckteschell. 9013. Centrifugal pumps. Internationale Rotations- Maschinen-Ges., Lehne, and Lucke. 17995. Elevators for handling ore and the like, more parti- cularly in ships’ holds. Donaldson. 18103. Process of treating iron ores to obtain a new product for use in smelting. Holling worth and MacGowan. 21950. Pumps for compressing or exhausting air and gases. Fleuss. 22066. Machines for charging and discharging retorts. Aldridge. 22081. Fluid compressors. Rendell. 22289. Preventive of corrosion on engine boiler plate and tubes. Regan. 23632. Railway and like hopper wagons. Metropolitan Carriage, Wagon, and Finance Company, and Wigley. 1915. 1415. Single rope or chain grabs. Priestman and Wright. 1814. Pit props. Verner. 4079. Means for collectively actuating and controlling alternating-current motors. Routin. 4142. Process for the manufacture of firebrick and like refractory material, paving and building slabs, artificial stone, and the like. Schauermann. 8101. Chain gearing. Douglas, and Douglas Saw and Machinery Company. 9390. Air filters. Mower, and Sturtevant Engineering Company. 9682. Electrically-operated change speed gear. Oester- reichische Daimler-Motoren Akt.-Ges. 10290. Picks for coal cutting machines. Shepherd and Sadler. 11771. Fluid pressure braking apparatus. Westinghouse Brake Company. GOVERNMENT PUBLICATIONS. ♦** Any of the following publications may be obtained on application at this office at the price named post free. Consular Reports, 1914: Ashanti, 4d.; Cyprus, 1914-15, 4d.; Australia Trade, 5Jd. Boiler Explosion Reports : ((No. 2381) at Messrs. Cooke, and Company Limited, Nottingham, 4|d.; (No. 2382) on the Steam Trawler “ Forth,” 24d. Board of Education : (List 176) List of Examinations, l|d. Board of Trade Journal Supplement, October 14, 1915 r Prohibitions of Export, 3M. Trade and Navigation Returns for October, Is. lid. PUBLICATIONS RECEIVED. ‘‘ The Geological Magazine ” (No. 617), November, price 2s.; “ The Journal of the Chemical, Metallurgical, and Mining Society of South Africa ” (Vol. 16, No. 2), September, price 3s.; “ Gassier’s Engineering Monthly ” (Vol. 48, No. 5), November, price Is.; ‘‘Bulletin of the Imperial Institute ” (Vol. 13, No. 3), July-September, price 2s. 6d.; “ The Journal of the South African Institu- tion of Engineers ” (Vol. 14, No. 3), October, price 2s.; “ The Manchester Geological and Mining Society : List' of Members 1914-15, and List of Council and Officers 1915-16”; ‘‘Shipping Securities,” compiled by E. Sully (Cardiff : E. Sully and Company). Imports of Pit Props in October.—During October 182,577. loads of pit props were imported into the United Kingdom,, the value being 4-588,428. The imports in October last year amounted to 238,804 loads, and the value £399,483. The total imports during the first 10 completed months of the year were 2,116,259 loads, valued at £5,829,055, as com- pared with 2,726,663 loads, valued at £5,560,288, in the corresponding period of 1914. Hull Coal Exports.—The official return of the exports of coal from Hull to foreign countries for the week ending Tuesday, November 2, is as follows :—Amsterdam, 712' tons; Alderney, 132; Calais, 698; Dunkirk, 2,932; Fecamp, 780; Gefie, 6,069; Guernsey, 971; Gothenburg, 1,063; Hon- fleur, 614; Harlingen, 736; Rouen, 33,093; Rotterdam, 2,567; Stockholm, 2,051; St. Nazaire, 2,003; Treport, 630 —total, 55,051 tons. The above figures do not include bunker coal, shipments for the British Admiralty, or the Allies’ Governments. Corresponding period November 1914, total 39,315 tons. Corresponding period November? 1913,. total, 98,348 tons.