1430 THE COLLIERY GUARDIAN. June 19, 1914. tions of the mixture and nature of the constituents. If added to the hitherto known nitro-cellulose or nitro-glycerin powders, it increases considerably their ballistic capacity. A powerful explosive substance surpassing in action blasting gelatine, can be made by mixing 36 parts of trinito toluol and 64 parts of hexanitro ethane. (One claim.) 28245 (1913). Improvements in the Direct Recovery of Ammonia from the Products of the Destructive Distillation of Coal or the like. The firm of Carl Still, of 2, Bismarckplatz, Recklinghausen, Westphalia, Germany.—Relates to an improvement and further development of the invention, described in patent No. 28072 A.D. 1912, as a process for the direct recovery of ammonia from the products of the destruc- tive distillation of coal or the like. According to this process the recovery of ammonia from the gases evolved during distillation is accomplished by initially cooling the gases by means of a continuously circulating quantity of water or liquor brought into direct contact with the gases, which latter, after passing through an intermediate cooler, are reheated by means of the water employed for the initial cooling to a certain degree, whereupon the ammonia is neutralised with acid in the usual way. The present invention is characterised by a certain volume of the gases, which have been deprived of their ammonia content in the saturator, and, finally, cooled down to a temperature suitable for their further use, being reconducted to the main gas current which they enter at a suitable position between the two stages of direct cooling and reheating. By these means the volume of gases to be reheated is correspondingly augmented, and similarly their capacity for saturation with aqueous vapours is enhanced, and, thus, the gases will more easily carry the required quantity of water. “A” is the column used for the direct cooling, and “ B ” that for direct reheating of the gases, “ C ” the intermediate cooler, and “ D ” the ammonia saturator. “ E ” and “ F ” are the tanks for collecting the liquids flowing from the apparatus “ A ” and “ B ” respectively. Between the apparatus “ B ”, employed for reheating the gases, and the intermediate cooler “C ”, a gas exhauster “ S ” is provided, which serves for imparting motion to the gases within the plant. Behind the ammonia saturator “ D ”, an additional final cooler “ K ” is arranged. The gases are impelled successively through the direct cooler “A ”, the intermediate cooler “ C ”, the direct heater “ B ”, and the saturator “ D ” by means of the exhauster “ S”, whereby they are first cooled, and then reheated in the two apparatus ‘‘A ” and “B ” respectively by means of a continuously circulating quantity of water or liquor according to the patent cited. The gases which pass through the main “w” in a heated condition to the saturator “ D ”, escape from the. latter with a slightly higher temperature through the pipe and enter the final cooler “ K ” in which they are cooled down to a temperature suitable for their later use. During, this final cooling, the aqueous vapour present in the gases is condensed and the condensate flows out at “re” into the seal pot The cooled gases leave the cooler. through the pipe-main “w”. From the latter a return pipe-main “t/” is branched off, which is in connection with the suction main “t” of the exhauster “ S ”, and is provided with a regulating valve “ V ”. By this arrangement, a con- tinuous stream of cooled gases can be drawn through the pipe-main suitably regulated by the valve “ V ”, and can be reintroduced into the main current of the gases. By these means the volume of cooled gases entering the heater “ B ” at “Z” is augmented in any desired proportion. Generally the volume of cooled gases reintroduced into the system which will suffice for the purpose corresponds to a part, for example about a half to approximately the whole of the gases originally entering the process. A further advantage is secured in this process by raising the tempera- ture of the subsidiary stream of gases, reconducted through the pipe-main “i/”, to a certain degree, preferably not in excess of the final temperature of the gases at the exit to the heater “ B ” wherein they have been reheated. This can readily be accomplished by utilising the heat of the hot crude gases or that of* the finally treated gases before their final cooling in the cooler “ K ”, for example, by leading the pipe-main “t/” for a certain distance inside the suction main in which the hot crude gases from the ovens are conducted to the condenser ‘‘A ”, or by using the heat contained in the gases after leaving the saturator “ D ” for a preliminary preheating, or even for the complete heating of the subsidiary stream before it is influenced by the temperature of the hot crude gases. (Two claims.) 29494 (1913). Improvements in or relating to Coke Ovens. N. Schuster, of 7, Princes-street, Westminster, relates to coke ovens of that type in which the gas for combustion is admitted through passages in the structure below the heating flues, and in which flues running parallel with the said gas passages and also below the heating flues, serve for the exit of the products of combustion at one time, and at another time for the passage of air to the heating flues to support combustion therein. The primary object is to provide means whereby the gas for combustion admitted shall not become too highly heated during its flow from the passages beneath the ovens. There is provided, adjacent and parallel to such passages, a cooling passage extending entirely through the structure and arranged between each gas passage and exit flue for the products of combustion, the cooling passages being open to the atmosphere, and in some cases such air cooling passages are connected at some point in between their ends with one or more of the flues in the oven which is in communication with the uptake, so that a current of cool air is automatically drawn through said air cooling passages. In order to regulate the flow of gas for combustion to the combustion flues, the passage extending into the structure, into which the gas for combustion is admitted, is made tapering at that end farthest away from the supply, that is to say, the inner end of the passage is formed of gradually decreasing cross sectional area, and in conjunction with such an arrangement in some cases an auxiliary parallel passage is provided, supplied at its outer end with combustion gas, and communicating at its inner end near the inner end of the first mentioned gas passage so as to provide an auxiliary supply of gas to the main or principal gas passage at some intermediate portion of its length. Beyond this the nozzles of the gas passages are located within a chamber having inwardly and upwardly inclined side walls, one of the walls overhanging the nozzles, and within the chamber a recess is provided parallel to the nozzles to receive any debris, all as hereafter described. The accompanying drawing shows a vertical section of the structure, the right hand half of this figure being taken through the heating chamber in one of the side walls between the ovens, and the left hand half of the drawing being taken through the adjacent coking chamber. (Eight claims.) NEW PATENTS CONNECTED WITH THE COAL AND IRON TRADES. Applications for Patents. 13828. Clinometers. J. A. L. A. Eliphelet. 13835. Manufacture of steel and iron. C. V. Burton. 13865. Distributing valves for steam pumps and the like. C. Barrance. 13878. Stone crushing machine. 0. Wauthier. 13890. Machines for shearing metal and the like. C. J. Rhodes and T. H. Webb. 13891. Signalling apparatus such as is employed in col- lieries. John Davis and Son (Derby) Limited and F. F. MacDonald. 13901. Device for signalling and indicating, applicable to the winding plants of coal mines. W. Wilson. 13930. Apparatus for purifying gaseous fluids by means of a centrifugal fan or centrifugal compressor. Soc. d’Exploitation des Appareils Rateau. 13933. Electric cables. E. G. Waters and Callender’s Cable and Construction Company Limited. 13934. Carbonising fuels. A. M. Duckham. 13935. Retorts for carbonisation of coal or the like. A. M. Duckham. 13936. Mechanism for charging horizontal or inclined retorts for carbonising coal or the like. A. M. Duckham. 13937. Processes of continuous distillation. A. M. Duckham. 13948. Manufactured or patent fuel. W. T. Vint and S. G. Grimshaw. 13951. Electric furnaces for metallurgical purposes. Hans Nathusius and Westdeutsche Thomasphosphat- Werke G. M. b. H. 13964. Tell-tale for vertical retorts. A. M. MacLeod and W. J. Jenkins and Company Limited. 13983. Riveting together plates in metal structures. C. G. Read. 13995. Method of manufacture’of chains and links for coup- lings and other purposes. J. F. Wake. 13998. Coal cutter picks of the “puncher” type. H. Hawkins, T. G. Jones, and Hardy Patent Pick Company Limited. 14004. Explosives. G. Spica. 14013. Composite fuel briquettes for heating and production of cement, clinker, or ash. E. Eaton. 14036. Friction blocks for brakes. Soc. Fran^aise Metal- lurgique (Proced&s Griffin) and Soc. G. Getting et A. Jonas. 14054. Boilers. H. Schubert. ' 14056. Stopper for inclined gas retort. W. Schofield. 14057. Signal indicator. A. Lees. 14061. Doors for automatically discharging -railway wagons. ■ • W. T. MacLellan. 14081. Electrically operated cranes, elevators, colliery wind- ing gear, crane luffing devices, and the like. G. Neale and C. H. Nicholson. 14086. Apparatus for cutting metals. G. and A. Harvey Limited and A. B. Clements. 1913. 14095. Safety lamps or the like and apparatus in connection therewith. E. A. Hailwood. 14117. Process for the recovery of metals and their salts . from metalliferous ores. S. P. Eastick. 14134. Axles-boxes and a method of lubricating the axles of colliery tubs or corves and the like vehicles. H. Jones. 14138. Steam and other elastic-fluid turbines. A. Bonom. 14141. Grinding mills. F. Aeschbach. 14149. Tubular surface condensers. D. B. Morison. 14188. Underground conveyors for the transmission of coal to various parts of a mine or pit. S. Hare. 14199. Haulage shackles for colliery wagons. G. Owens. 14228. Apparatus for coating metal plates with tin, terne, and other metals or alloys. P. B. Tayler. 14234. Apparatus for crushing ore and the like. W. B. Easton. 14243. Collecting gas main for coke ovens. Firm of Carl Still. 14244. Respiratory apparatus. S. W. Richards and J. E. Spickett. Complete Specifications Accepted. To be published July 2. 1912. 29714. Distillation of carbonaceous substances. Clarke and Carmichael. 1913. 4629. Machine for charging and discharging gas retorts and the like. Kew. 5873. Utilisation of peat. Rigby, Andrew and Wetcarbon- ising Limited. 12915. Separating or grading apparatus. Wilkinson and Wilkinson. 13283. Method of transmitting and controlling power applied to or in connection with the winding drum of lifting machinery or the like, and for effectually braking the same. Dawson and Dawson. 13693. Valve gear of steam driven pumps. Little. 13796. Anemometers. Ogilvie. 14419. Rope-making machines. Fried. Krupp Akt.-Ges. Grusonwerk. 14519. Railway rail-joints. Wattmann, and Tudor Accumu- lator Company. 15396. Means for transporting loads. Sir W. G. Armstrong r Whitworth and Company, and Farquharson. 16370. Process and apparatus for converting hydro-carbons into gas. Empis. 16671. Internal-combustion pumps. Wallace. 26233. Process for the manufacture of nitrate of ammonia. Herschell (Wulfing, Dahl and Company). 26395. Checking device preferably for use in coal mines, for checking the number of corves or tubs of coal delivered by the miner, or for other analogous purposes. Firm of E. Nack’s Nachfolger. 26997. Testing instruments for electric conductors. Faries. 29293. Apparatus for opening and closing, either automatic- ally or by lever, collapsible gates on a shaft cage opening or a lift cage. Williams. 1914. 272. Grinding mill for hard materials. Aldehoff. 3718. Truck-pushing conveyors. Pocher. 5658. Automatic device for starting and stopping the cutting apparatus in brick-cutting machines. Ruetz. Complete Specifications open to Public Inspection before Acceptance. 1914. 11562. Production of coke poor in sulphur. Fingerland and others. 12012. Starting transformers. Akt.-Ges. Brown, Boverir et Cie. 12443. Insulator for the overhead conductors of electric lines. Lib ano. 13600. Multi-stage centrifugal pumps. Geb. Sulzer. 13708. Rope railways. Thunhart. GOVERNMENT PUBLICATIONS. Any of the following publications may be obtained on application to this office at the price named post free. Consular and Trade Reports, 1913 : Greece, Piraeus, 3d.; Dominican Republic, 3d.; Hayti, 3d.; Index to Consular Reports, 1913, 7Jd. Royal Commission on Railways, 25th day, May 21, 1914, Is. Old. National Insurance : Special Extension Order Unemploy- ment Insurance, No. 370, l|d.; Enquiry with regard to Draft Special Extension Order relating to Repairing Works of Construction, one day, June 15, Is. 0|d. Poor Relief, England and Wales : Statement for half year ending September 1913, 4Jd. Bills : Compulsory Co-partnership, Id.; Foreign Com- panies Control", Id. Factory Form : Register of Young Persons, 7|d. PUBLICATIONS RECEIVED. Coal Mining. By T. C. Cantrill. London : Cambridge University Press. Price Is. Kurzer Leiteaden der Bergbaukunde. By F. Heise and F. Herbst. Berlin : Verlag von Julius Springer. “ The Journal of the Institution of Mechanical Engineers ” (No. 1), June; “ Report of the Department of Mines, Nova Scotia, 1913”; “Monthly Bulletin of the Canadian Mining Institute” (No. 26), May; “Records of the Geological Survey of India ” (Vol. 44, Part 1), price Ir. OBITUARY. The death has taken place of Mr. George Henry Harrison, joint manager of the mechanical engineering works of Messrs. George Harrison and Company Limited, Ure Bank, Ripon. The death is announced at Newcastle-under-Lyme of Mr. George James Crosbie Dawson, engineer to the North Staffordshire Railway Company. Mr. Theobold Fitzwalter Butler, head of Messrs. Butler Limited, iron, steel, and coal merchants and shippers, died at Barrow on Tuesday. Judge James Valentine Austin, who had been judge of county court circuit No. 54, which includes Bristol, since 1892, died at his residence at Clifton last week, in his 63rd year. Judge Austin had a sound and wide knowledge of law, and was much in demand as a member of arbitration and conciliation bodies, the Board of Trade frequently calling for his services as arbitrator in trade disputes. He was independent chairman of the Bristol Minimum Wage Board. Mr. Joseph Cliff, J.P., D.L., a director of the Froding- ham Iron and Steel Company, died at Scawby Grove, near Brigg, on Tuesday. Mr. Neil M‘Neill, of the firm of Messrs. Neil M‘Neill and Company Limited, iron and steel merchants, Glasgow, has died at Kilmacoln. Mr. M‘Neill joined the firm of Messrs. James Watson and Company, with which he stayed until its dissolution last year. At the age of 71 years, Mr. William Berkley, of Annfield Plain, has died. Deceased worked 50 years without a break for the South Derwent Colliery Company, never losing a day through illness or accident during the whole of that period. Mr. Nicholas Proudlock, master shifter for the South Moor Collieries Company, has just died at 58 years of age. Mr. Proudlock has been sinking for the company since he was a boy.