868 THE COLLIERY GUARDIAN. May 4, 1917. one groove 24 is so positioned that the outer ends of the holes 21, 22 are placed in communication by it. The other and rear groove 25 is so positioned that in the normal posi- tion of the anvil block 4, the packing ring completely closes it, and overlaps it to a sufficient extent to prevent the water leaking from said groove past the packing in the direction of the cylinder 1. It is also so placed as to allow of a reasonable amount of wear between the anvil block 4 and its guide 3, and still effectively prevent leakage in the direction of the cylinder 1. (Six claims.) 104935. Improvements in the Method of and in Means for Operating Slide Valve Motive Power Engines. F. W. Payne, of 62, London Wall, London, E.C.—Relates to slide valve motive power engines, in which the slide valve is balanced more or less by admitting motive fluid at initial pressure between the slide valve and its seat. Fig. 1 is a longitudinal section through the cylinder and slide valve; fig. 2 is a transverse section; fig. 3 is a part of fig. 1, but having the valve moved to a different position; and fig. 4 is a longitudinal section through a modified form. In figs. 1, 2, and 3, a is the cylinder liner, with the terminal ports b and c opening into it, and d is a piston adapted for work- ing in the liner in the well known manner. The cylinder and valve chamber casting e is formed with a central port /, which opens in the valve seat face g, and is in com- munication with the boiler by way of the jacket space h, which is connected to the steam pipe at i. The slide valve ; is provided with a steam passage k, opening at I and m to the face of the valve j. n is a plate spring that may be fitted if required, to keep the valve j up to the valve seat g. The valve works in a chamber o, having an exhaust outlet p. Steam entering by way of the central port f is admitted to the cylinder through the port k in the valve. Suppose that steam is to be admitted to the cylinder for driving the piston d from the position in which it is shown, the valve 7 is moved toward the left so that the port k at its end m is more or less open to the port f, and at its end I similarly open to the port b. Steam will then be admitted to the piston by way o£_thtS port f, passage k, and port b. At the end of its travel towards the left, the valve 7 returns, and the cut-off is effected by the closing of the port b by the left-hand portion of the valve, and the closing of the port / by the bridge separating the openings I and m of the passage k. Expansion takes place during the further travel of the valve toward the right, owing to 1 ! a. ,h the obturation of the port b by the left-hand lap of the valve 7, until release begins by the opening of the said port b to the valve chamber 0, into which the used steam exhausts to escape through the outlet p. The pressure tending to lift the valve 7 never exceeds that due to the combined area of the ports I and m, and that this pressure may be balanced by the exhaust pressure in the chamber 0, with the assistance of the spring n if required, so that the work available from an engine according to this invention as compared with an ordinary slide valve engine is increased by that proportion of the work required in the latter to move the heavily-loaded slide valve. Moreover, the tendency of the slide valve to leak is diminished accord- ing to this invention. The ordinary slide valve, when worn, leaks at both of its outer.lap edges into the cylinder ports, but steam from the port / cannot leak so easily. In the position of the valve shown in fig. 1 steam cannot leak to the port b or c without travelling between the valve and its seat the distance from port / to the port b or c, which distance is great as compared with the distance from the chamber 0 to either cylinder port. In fig. 3, also, in which the cut-off is shown as just taking place, leakage from port f to port c is similarly prevented, not only by the closure of the port f by the bridge between openings I and m, but also by the relatively great distance to be traversed by the steam between the valve and its seat. In the modification illustrated by fig. 4, the steam jacket h1 communicates by ports f1 and f2 with passage k1 and k2 in the slide valves 71 and 72, and with the cylinder ports b1 and c1 respectively at the required times. These valves 71, j2 are both united by a valve rod q, so that they move together, and are pre- ferably furnished with lap or terminal portions adapted to operate in the manner explained with reference to the valve 7, as will be understood, n1 and n2 are springs that may be employed to keep the valves to their seats. (Five claims.) 104942. Improvements in the Recovery of Ammonium Chloride as a By-Product in the Manufacture of Gas or Goke. E. Myers, of 6, Lower-crescent, Harpfields, Stoke- on-Trent ; and the Shelton Iron, Steel and Coal Company Limited, of Stoke-on-Trent.—The invention is for improve- ments in the recovery of ammonium chloride as a by-pro- duct in the manufacture of gas or coke, and has for its object to provide the recovered ammonia free from colour- ing matter, by agitating the chloride in solution, when at boiling point, in the presence of carbon introduced in fine particles. In one method of carrying out the invention, the chloride solution obtained .from the retorts is evap- orated, for example, in a Kestner evaporator, so that the salt is left in crystal form, but dark in colour. This salt, which is dried and thus freed from water, is ground up with 2 per cent, of its weight of nitro-hydrochloric acid, and the mixture is then dissolved up to make a solution which can be treated with the carbon. The solution is boiled in an open tank by means of live steam blown into it, which steam also carries air into the solution by an injector action. Fine particles of carbon are mixed with the solution, and, together with the air, effect the desired decolorising. After boiling for about a quarter of an hour, ammonia is added to the solution to neutralise it, and the whole is then filtered, and the solution once more evaporated until the requisite strength for crystallising is obtained. The resulting salt is dried by centrifugal or other means. (Five claims.) MEW PATENTS CONNECTED WITH THE COAL AND IRON TRADES. Applications for Patents. [Note.—Applications arranged alphabetically under the names of the applicants (communicators in parentheses). A new number will be given on acceptance, which will replace the application number.] Allwood, S. J. R. Apparatus for cleaning boiler, etc., fur- naces of non-combustible residue. (5716) Bagley, D. and E. A. Method of introducing combustion gases into heating flues of coke ovens, etc. (5920) Bowler, L. P. Distillation of gasoline from oils. (5655) Breeden, C. L. Dynamo electric machines. (5663) British Thomson-Houston Company (General Electric Com- pany). Elastic fluid turbines. (6032) Brotherhood Limited, P., and Bryant, C. W. Internal combustion engines of the super-compression or super- charging type. (5830) Cairns, H. S. Pump for use in petroleum wells. (5905) Campbells and Hunter. Method for briquetting metal turnings. (6011) Cass, A. T. Grate bars for furnaces of steam boilers, etc. (5809) Cherry, T. W. Internal combustion engines, etc. (5935) Chorlton, A. E. L. Internal combustion engines. (5974, 5975) Coleman, H. S. Cleaning or pickling metal articles. (5979) (Commercial Research Company). Rotary furnace struc- tures. (5759) Crockford, C. Apparatus for cleaning boiler, etc., fur- naces of non-combustible residue. (5716) Davis, W. H., and Davis and Son, J. Switches for miners’ electric lamps. (5815) Fison, F. J. Cooling internal combustion engine and air compressor cylinders, etc. (6005) Foster, W. J. Superheated air blast for furnaces. (5703, 5704) Foulkes, J. Apparatus for destructive distillation of wood. (5774) Fowler, H. Valve gear for internal combustion engines. (5731) Frost, C. R. B. Internal combustion engines of the tandem cylinder type. (5817) Gilchrist, A. L. N. Internal combustion engines. (5964) Hadfield, Sir R. A. Manufacture of steel. (6038) Hambly, W. M. Internal combustion engines. (5757) Harker, W. E. Internal combustion engines, etc. (5935) Harvey Frost and Company. Liquid fuel burners. (5992) Hinks, L. S. Internal combustion engines. (6027) Honegger, G. Expansion valves for simplex steam pumps. (5930) Hughes, G. M. C. Fuel, and manufacture of same. (5971) lonides, A. C. Melting furnaces. (5980) Kelly, T. D. Steam or vapour pressure engines and vapour or air compressors. (5846) Kingsland, W. Dynamos. (5811) Korte, C. Method of briquetting metal turnings. (6011) Lang, C. R. Duplex pumps. (5650) Leadbetter, T. A. N. Internal combustion engines. (5964) Lovell, R. G. Fuel, and manufacture of same. (5971) Lucas, H. Dynamo electric machines. (5663) Lynn, G. W. Cooling internal combustion engine and air compressor cylinders, etc. (6005) Manifold, N. W. Pneumatic drilling machines. (5796) Maschinenfabrik Oerlikon, and Muller, E. Tubular heat interchangers and surface condensers. (5891) Mate, W. C. A., and Poulson, A. Production of malleable cast iron. (5962) Morris, H. E. Liquid fuel burners. (5992) Mort, G. F. Internal combustion engines. (5812) Paterson, A. Distillation of gasoline from oils. (5655) Peterson, J. Power developing and transmitting devices. (5882) Rammage, A. W. Apparatus for boring, etc., in earth, rock, etc. (5913) Ravenna, G. Reversible steam turbines. (5697) Robinson, W. Supplying steam generators with feed water. (5866) Ruston, J. S. Internal combustion engines. (5974, 5975) (Saunders Motor Power Company). Rotary engine. (5841) Saunderson, H. P. Governor control mechanism for internal combustion engines. (5677) Seilens, F. C. Chain grate, etc., travelling stokers. (5827) Shaw, C. M. Water tube steam generators. (5707) Silberrad, O. Explosives. (5855) ; Smethurst, II. Oil extracting, cooling, etc., apparatus for use with compressed air. (5664) Stevenson, A. C. Valve gear for internal combustion engines. (5731) Tate, W. H. Internal combustion engines. (5964) Thorne, G. Internal combustion engines of the tandem- cylinder type. (5817) Urquhart, W. J. Steam traps. (5720) Vickers, W. B. R. Double-acting pump. (5998) Wake, H. Gravity engine. (5942) Weir, G. and J. Duplex pumps. (5650) Westinghouse Machine Company. Power developing appa- ratus. (5762) Woodvine, G. Vertical steam boilers. (5719) Complete Specifications Accepted. (To be published on May 17.) 1915. 3145. Petit le Brun. Pistons and the like. 1916. [Note.—The number following the application is that which the specification will finally bear.] 1879. Bischof, B. Working of combustion turbines. ' (100072) 3541. Risk, A. Hand-operated apparatus for rotating a drill or other rotary tool or implement. (105576) 3947. Drakes Limited, and Drake, J. W. Apparatus for controlling the draught on furnaces. (105579) 3954. Hailwood, E. A. Miners’ safety lamps. (105580) 5450. Bricknell, W. H., and Burt, A. Gas producers. (100730) 5517. Baumann, K. Steam condensing plants having jet air pumps using water as the operating medium. (105595) 5619. Bove, L. da. Fire bridge for furnaces and the like. (105603) 5668. Southey, A. W. Production of gaseous fuel for ■ internal combustion engines. (105606) 5742. Everitt and Company, W., and Everitt, W. Ball . mills. (105614) 5802. Armstrong, Whitworth and Company, Sir W. G., and Ashdown, H. H. Casting steel ingots. (105617) 5822. Marks, E. C. R. (Soc. Anon, des Ateliers de Con- structions de la Meuse). Steam superheaters. (105624) 6297. Dehn, F. B. (Schofield, G. L.). Rotary valve for internal combustion engine. (105639) 6640. Smith, J. Machinery or apparatus for charging and withdrawing ingots into and from furnaces and/or stripping ingots. (105644) 6896. Voss, E. Two-stroke cycle internal combustion engines. (105649) 9164. Armstrong, Whitworth and Company, Sir W. G.., and Le Mesurier, L. J. Pumping systems. 9355. Sickman, D. V. Hydraulic appliances for breaking down coal and other material in mines. (105680) 11061. Shaw, C. M. Steam generators. (105692) 11657. Cockburns Limited, Cockburn, D., and MacNicoll, D. Steam valves. (105695) 12293. Smith, C. H. Process for treating coal and pre- paring the same for coking purposes. (101539) 14353. Whitaker, D. Bucket line excavators. (105711) 14886. Midgley, A. H., and Vandervell and Company, C. A. Dynamo electric machines. (105714) 14994. Howden and Company, J., and Hume, J. H. Steam generators. (105716) Complete Specifications Open to Public Inspection Before Acceptance. 1917. [Note.—The number following the application is that which the specification will finally bear.] 4133. Soc. Anon, des Ateliers de Constructions Mecaniques Escher, Wyss et Cie. Cooling devices in multi- stage centrifugal compressors. (105748) 5033. Montgomery, P. W. Two-cycle-stroke internal com- bustion engine. (105752) 5460. Hallback, C. A. Internal combustion engines. (105760) 5517. Raymond Brothers Impact Pulverizer Company. Pulverising apparatus. (105763) 5572. Rosenthal, M. Centrifugal fans, exhausters, com- pressors, blowers, etc. (105766) 5573. Grand jean, A. Apparatus for loading loose materials from bulk. (105767) GOVERNMENT PUBLICATIONS. *** Any of the following publications may be obtained on application at this office at the price named post free. Ministry of Munitions: Health of Munition Workers Committee Interim Report, 1917, price Is. 3d. net. Statutory Rules and Orders, 1917: (No. 379), Order of the Secretary of State, Determining Fees to be Paid by Applicants for Certificates of Competency, price Id. net. PUBLICATIONS RECEIVED. “ Bulletin of the Imperial Institute” (Vol. 14, No. 4), October-December, 1916, edited by the Director of the Imperial Institute; “Journal of the Western Society of Engineers” (Vol. 21, No. 7), September 1916; “Pro- ceedings of the Institution of Mechanical Engineers ” (October-December 1916); “The Oil and Petroleum Manual, 1917,” by W. R. Skinner, price 2s. 6d. net; “Monthly Bulletin of the Canadian Mining Institute,” edited by the secretary (No. 60, April 1917); “ The Journal of the Manchester Geographical Society ” (Vol. 32, Parts 1-4), 1916;-“The Iowa Engineer” (Vol. 17, No. 6), March 1917; “Proceedings of the Engineers’ Society of Western Pennsylvania” (Vol. 33, No. 2), March 1917. United States Geological Survey, Department of the Interior:—(Professional Paper 91), “ The Lower Eocene Floras of South-Eastern North America,” by E. W. Berry; (Professional Paper 98—I), “ A Reconnaissance of the Archean Complex of the Granite Gorge, Grand Canyon, Arizona,” by L. F. Noble and J. F. Hunter; (Professional Paper 98—J), “North American Upper Cretaceous Corals of the Genus Microbacia,” by L. W. Stephenson; (Professional Paper 98—K), “ Some Palaeo- zoic Sections in Arizona and their Correlation,” by F. L. Ransome; (Professional Paper 98—M), “The Catahoula Sandstone and its Flora,” papers by G. C. Matson and E. W. Berry; “Secondary Metals in 1915,” by John P. Dunlop; “Manganese and Manganiferous Ores in 1915,” by D. F. Hewett; “ Silver, Copper, Lead, and Zinc in the Central States in 1915,” by J. P. Dunlop and B. S. Butler; “Bauxite and Aluminium in 1915,” by W. C. Phalen; “Potash Salts, 1915,” by W. C. Phalen, with “ Simple Tests for Potash,” by W. B. Hicks; “ Asphalt, Related Bitumens, and Bituminous Rock in 1915,” by J. R. Northrop; “ Cement in 1915,” by Ernest R. Burchard; “ Sand and Gravel in 1915,” by R. W. Stone; “Lime in 1915,” by G. F. Loughlin; “ Salt, Bromine, and Calcium Chloride in 1915,” by W. C. Phalen. United States Bureau of Mines, Department of the Interior:—“The Nitration of Toluene,” by E. J. Hoff- man; “Monthly Statement of Coal Mine Fatalities in the United States,” August 1916, compiled by A. H. Fay; (Bulletin 108), “Melting Aluminium Chips,” by H.’W. Gillett and G. M. James; (Bulletin 134), “The Use of Mud-Laden Fluid in Oil and Gas Wells,” by J. O. Lewis and W. F. McMurray; (Technical Paper 82), “ Oxygen Mine Rescue Apparatus and Physiological Effects on Users,” by T. Henderson and James W. Paul; “ Rescue and Recovery Operations in Mines After Fires and Explosions,” by James W. Paul and H. M. Wolfin. South Staffordshire Iron and Steel Institute.— At the annual meeting of the institute, at Dudley last week, Mr. J. E. Fletcher (Messrs. N. Hingley and Sons Limited) was elected president for a third year. In reply, he said he firmly held the opinion that institutes of that kind were going to be more important in the future, and that through co-ordination of effort they were going to have a great effect on science, technical education, and metallurgy generally. As an evidence of this, he mentioned the recent invitation of the Iron and Steel Institute of Great Britain to that and kindred associations to join their councils, while the Institute of Metals had asked him to give a paper on the ferrous and non-ferrous sides.—Mr. J. Piper was elected treasurer for the 25th time, Mr. G. Carrington vice-president, and Mr, C. B. Pugh secretary.