356 THE COLLIERY GUARDIAN. February 14, 1913. at a pressure greater than atmospheric pressure. In the figures the conveyor is shown having made half its move- ment, at which time it is travelling at its greatest velocity. As the conveyor moves towards the left air will be compressed in the cylinder, and as the conveyor moves towards the right the expansion of the air accelerates its motion. (Three claims.) 17753 (1912). Improvements in Divers’ Helmets. Driiger- werk Heinr. and Bernh. Drager, of 53, Moielinger Allee, Lubeck.—This invention relates to helmets of diving apparatus, and has for its object to prevent as far as possible accidents due to sudden changes of pressure inside the apparatus. In accordance with the invention the helmet is wholly made of pliable or resilient material. Preferably the helmet is formed from the same material as the dress. The increased pressure arising in the case of a fall in this case also produces a compression of the enclosed air to the extent of a quarter in the example selected. The pressure does not, however, act only upon the trunk and limbs, but also upon the head, so that the blood cannot rise to the head, but equilibrium is produced throughout the entire body, so that the diver is able to adapt his quantity of air to the fresh depth uninfluenced by bodily impediments. The drawing illustrates a man clad in a diving dress, the latter in section. When the helmet is made of elastic material, it may advantageously be provided with a special insertion or covering of considerable tensile strength, in order that it may afford a certain resistance to excessive internal pressures. On leaving the water the quantity of air contained in the dress expands, and if the diver should leave the water too suddenly, or if a sufficient quantity of air is not discharged at once, very considerable differences of tension arise. If desired the pliable or elastic helmet can be surrounded by a stiff but perforated helmet, or a rigid sieve-like casket or the like, in order to protect the head of the wearer from external influences, blows and so forth. (Three claims.) GOVERNMENT PUBLICATIONS. Any of the following publications may be obtained on application to thia office at the price named post free. Report on the Industrial Investigation Act of Canada (6603), 4.jd. Trade and Navigation Returns for January, Is. 2d. Kew Bulletin, Vol. for 1912, 4s. lid. Science Examination Papers for 1912, Is. Id. Census of Production Bules : December 14, 1912 (No. 1912), ditto December 20, 1912 (No. 1913), l|d. each. National Insurance Regulations : Special Order, Jan. 25, 1913, re Subsidiary Employment (196 iii.), Id.; Account of Approved Society, January 20, 1913, Id. Trade Reports : St. Vincent, 1911-12 (747), 5d. Gas Authorities: Residual Products Report, House of Commons (392), 2s. Id. Hull Coal Imports.—The official returns show that during last month the quantity of coal imported into Hull was 643,286 tons, of which 598,380 tons were by rail and 44,906 by river. The corresponding total in 1912 was 532,288 tons. The chief collieries contributing towards these figures were:—Bentley, Carlton Main, Grimthorpe and Frickley Dalton Main and the Denaby and Cadeby Main collieries. PUBLICATIONS RECEIVED. South African Minins Directory and Monthly Hand- book, November 1912, No. 1. Johannesburg : South African Mining Directory Limited. Mine Gases and Gas Testing. Wigan: Thos. Wall and Sons Limited. Price 2s. 6d. Elements of Hydraulics. By M. Merriman. New York: John Wiley and Sons. London: Chapman and Hall Limited. Price 4s. 6d. net. The Mining Manual, 1913. By W. R. Skinner. London : W. R. Skinner. Price 15s. net. “ Cassier’s Magazine” (Vol. 43, No. 2), February, price Is.; “ The War Against Bribery,” by R. M. Leonard, London: The Secret Commissioners and Bribery Prevention League, price 6d.; “ Report of the Board of Governors of the Public Library, Museum and Art Gallery of South Australia for 1911-12.” HEW PATENTS CONNECTED WITH THE COAL AND IRON TRADES. Applications for Patents. 2711. Steam evaporator. H. E. Lace. 2712. Process for the production of a new source of heat and steam without the use of fuel. E. Montgomery. 2714. Driving-belts. D. E. Brown and R. T. Shelley Limited. 2718. Electric furnaces. F. C. Wardall and J. Marchant. 2719. Enamel for preserving iron and steel from rust. O. G. Trigg. 2724. Water-heaters. F. A. Woollcott. 2727. Carbonisation of coal. A. Rollason. 2728. Method of and means for simultaneously cooling producer gas and manufacturing salt by the evaporation of brine. A. Burrows and J. Charlton. 2761. Conveyors and elevators. A. B. Taylor. 2766. Process and apparatus for heating peat and like muddy substances preparatory to mechanically draining the same. G. Wolters. 2797. Combustion chamber in suction gas plant. J. Maude. 2798. Railway and like wagons. Leeds Forge Company Limited and R. G. Sharp. 2844. Fuel and arrangements therefor. G. J. Epstein. 2850. Pumps. G. D. Loud. 2863. Process for the extraction of tin from tin slag or tin ore. H. C. Woltereck and J. Moeller. 2865. Combined coal saver, heater, and kettle boiler. M. H. Silva. 2879. Safety devices for cages or lifts employed in mines or places. C. W. Zerenner. 2887. Pumps. J. E. Mortimer. 2921. Steam and gas turbines 'for compensating the axial expansion due to heating. Aktiebolaget Ljung- strbms Angturbin. 2922. Steam turbine. Aktiebolaget Ljungstroms Angturbin. 2932. Manufacturer of armour plate. S. O. Cowper-Coles. 2933. Process of rolling metal. S. O. Cowper-Coles. 2934. Machine for polishing metallic surfaces. S. O. Cowper-Coles. 2935. Process of recovering copper from its ores. S. O. Cowper-Coles. 2936. Process for the concentration of ores. S. 0. Cowper- Coles. 2963. Hand-worked face conveyor. C. A. Nelson. 3003. Machinery embodying rotary screens and elevators in combination. Sir R. A. Hadfield, A. M. Jack and W. T. W. Miller. 3011. Apparatus for measuring the percentage of foreign gases present in the atmosphere for use in mines or for like purposes. A. E. Culley. 3028. Centrifugal air-compressors. British Thomson- Houston Company Limited. 3035. Process for the gasification of fuels, especially those of a fine-grained nature. F. C. W. Timm. 3037. Air-compressors. J. R. Kinney. 3046. Magnetic separators. Bowes, Scott and Western Limited and I. S. Dalgleish. 3078. Water circulators for steam generators or boilers or the like. A. E. Blizzard, R. Cotton and H. Todd. 3115. Miners* lamps. F. E. Baldwin. 3134. Miners’ measuring rod. B. Harry. 3142. Furnaces for roasting ores. Soc. Miniere et Metal- lurgique de Peiiarroya. 3147. Coke furnaces. Stettiner Chamotte-Fabrik Akt.- Ges. vorm. Didier. 3175. Jumper or drill for drilling holes in rook. W. H. Whitby. 3345. Steam traps. P. M. Justice. Complete Specifications Accepted. To be published on February 27. 1912. 132. Device or apparatus for preventing overspeeding and/or overwinding in connection with mine cages, elevators and the like. Wilson and Reah. 2657. Apparatus for preventing overwinding at collieries mines or other places. Ashton 2860. Rolling mills. Dixon and Taylor. 2926. Centrifugal pumps. Barbezat. 2944. Doors for coke ovens and the like. Limberg. 2951. Trucks, transporters or the like. Vickery. 3015. Device for sharpening rock drills or rock borers. Rorive. 3152. Furnaces. Smallwood. 4312. Smoke consuming and preventing, and fuel-econo- mising apparatus for furnaces and the like. Clarke. 4905. Apparatus for transporting and discharging mate- rials from grabs, skips and the like. Stothert and Pitt Limited and Barry. 4942. Haulage clips or grips for ropes and cables. Wass and Wass. 6328. Rope and cable haulage clips. Sanders. 7391. Rotary engines, pumps and compressors. Weed. 7727. Mechanical ore-roasting furnaces. Harris. 8668. Manufacture by electrolysis of sheet iron. Tischenko. 15443. Safety mechanism for the winding gear of coal pits and the like. Staley and Jackson. 16073. Props or stanchions for mines. Schulte. 18872. Double-acting hydraulic pumps. Whatley, Whatley and Whatley. 22049. Portable electrically - driven centrifugal fans. Davidson. 23283. Hydraulic air-compressors. Suida. Complete Specification open to Public Inspection before Acceptance. 1913. 2067. Process for the manufacture of return pieces for lengths of tube particularly applicable for superheater tubes. Heuser. The Price of Gas Coal.—Presiding at the half-yearly ordinary general meeting of the proprietors of the Gas Light and Coke Company Sir Corbet Woodall, M.Inst.C.E., stated that not for 17 years had they shown so large an increase in the sale of gas, and yet they were obliged to draw upon the balance accumulated in former years to provide for their dividend. Residual products, coke, tar, &o., yielded an increase of £102,000, of which £64,000 was attributable to the larger quantity of coal carbonised and .£38,000 to better prices. On the other side coal cost £188,000 more, cancelling the whole of their gain from the added sale of 7 J per cent, or 920,000,000 of cubic feet of gas. Little practical good could, he feared, result from any observations he might make upon the present position of the coal supplies, and yet the question was one of such vast importance to their own and other industries that it could not be passed over without comment. The Legislature insisted upon elaborate precautions to safeguard gas consumers. Was it not, therefore, an anomaly that while so much was demanded of the gas companies, the suppliers of coal were under no obligations or limitations whatever to the public ? The national coal strike of March last involved serious inconvenience and loss to the owners as well as to the whole community, but this was slight in comparison with what had happened since. Speaking on that subject a year previously he expressed the hope that the Government would, in the event of a general strike, reimpose a duty on exported coal, because “ by this means the difficulty of restarting factories and workshops caused by the exhaustion of stocks of fuel would be to some extent lightened.” What happened was that so soon as the pits were reopened there was a great and legitimate effort made to meet the foreign demand, and home industries were delayed and put to additional heavy cost on that account. Further, stocks were brought so low that manufacturers, afraid of a possible renewal of the trouble, strove to refill their stores, and so the demand exceeded the supply and prices advanced far beyond what a reasonable profit plus an extra charge for wages justified, and these prices would be maintained probably until the period of splendid trade now obtaining met with a serious check. What he was concerned about was the apathy and the heedlesness which left all users of coal in England at the mercy of a class, small in number, but great in influence, so situated as to be able to make the commodity as dear as suited its purpose. Failing the development of some form of agreement between owners and users, the Government should seriously consider the causes which bring about the repeated and enormous rises in the price of coal and the difficulties experienced by users generally, and gas companies in particular, in obtaining supplies. THE “ PROTO (FL PATEN rs'S) RESCUE APPARATUS -------------------------------- IS THE -- SAFEST APPARATUS NO INJECTOR EMPLOYED. ALWAYS UNDER POSITIVE PRESSURE. therefore no danger of drawing poisonous air into breathing circuit. All fatalities that have occurred have been with the Injector type. The “PROTO” has saved lives and an immense amount of property. It has never cost a life. Our bulletin of actual work done, sent free on request, will convince you as to its efficiency and reliability. Sole Makers: SIEBE, GORMAN & CO. LTD“ Neptune ” Works, And 187, Westminster Bridge Road. London, S.E. Telegrams, “ SIEBE, LONDON.” Telephone 251 Hop. R. HEBER RADFORD, SON, & SQUIRE, Engineering, Iron and Steel Works ------------------ VALUERS, --------------- Consulting: Engineers, Referees, Arbitrators & Patent Agents. ----------------- ESTABLISHED OVER 40 YEARS. --- (Senior partner, R. Heber Radford, Mem. Inst. Mechanical Engineers, Mem. Inst. Naval Architects, Mem. Iron and Steel Institute, Fellow Chartered Institute of Patent Agents.) 15, St. a me 8 Row, SHeffleld. Telegrams—‘‘ Radford. Sheffield.” Telephone—425. TRAM Nfl L5 5PIKE5 ALBERT fR05ToC9.M BI- HOWARD ST. M SHEFFIELD. SHOVELS, BUCKETS, WROT.I.PULLEYS, SIGNAL WIRE.