542 THE COLLIERY GUARDIAN September 10, 1915. 12596. Apparatus for indicating the rate of speed of engines and machinery. W. Chadburn and W. R. Chad- bum. 12597. Means for regulating and/or indicating temperature. I. Hall. 12603. Gas producers. J. Alexander. 12610. Explosive mixture. J. F. Buckingham. 12614. Electrical signalling or distant controlling plant. Fried. Krupp Akt.-Ges. 12618. Furnace grates. P. Comet and F. Coulon. 12645. Shackle for coupling colliery trams. T. Evans and G. Jenkins. 12669. Fuel. H. J. Tarrant. 12670. Fastenings for wire ropes and the like. Head, Wrightson and Company Limited, T. G. Wrightson, and J. M. Ringquist. 12713. Railway rolling stock. G. H. Sheffield and F. R. Rand and Company Limited. Complete Specifications Accepted. (To be published on September 23.) 1914. 13067. Power driven rock drills. Kellow. 13252. Pulsators. Johansson. 17364. Installations for discharging or unloading trucks. Karsch. 19080. Apparatus for oxygen administration to workmen in irrespirable atmospheres. Johnson. 19199. Rolling gear teeth. Anderson. 19313. Magnetic separation of ores. Schwerin. 19338. Means for discharging hoppers for railway wagons and for analogous purposes. Grant. 19363. Drying and super-heating steam. Rodriguez and Kerr. 19768. Elevating trucks. Wade. (McCallum and Chambers. 21264. Cold moulding of phenolic condensation products. Hemming, and Hemming Manufacturing Com- pany. 21368. Electric contact breakers or interruptors. Cooke. 22576. Axle-boxes of railway and like vehicles. McWilliams. 23019. Safety appliances used in collieries, tunnels, quarries, or the like. Thomas. 24141. Chains. Wirtz. 1915. 6080. Appliances used in the manufacture of tin-plates or sheets and other like metal-coated plates or sheets. Thomas, Thomas, Davies, and Lewis. 7364. Method of and apparatus for removing and loading a mass of coke located on a quenching bench. Carl Still (firm of). 9413. Grates of gas generators. R. and J. Dempster Limited, and Beard. 9891. Pneumatic elevators and conveyors. King. 11564. Power driven rock drills. Kellow. Complete Specifications Open to Public Inspection Before Acceptance. 1915. 12047. Ingot mould with vacuum chamber. Peyton and another. 12238. Method and apparatus for localising mine explosions and fires. Grasty and another. THE ACQUISITION OF ENEMY PATENT RIGHTS. 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, which right, when acquired, can be retained after the war, 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 Patents Register. If any patent listed has been assigned to a non-enemy proprietor, the law does not apply. 27520/06. Electric motor control; switches. In a control system for electric motors, the current taken by the motor or group of motors, that first reaches full speed controls the rheostats govern- ing the other motors, so that the latter are prevented from taking more current than the first. K. Kando, Hungary. 28562/06. Dynamo-electric machines. In starting electric motors, the starting resistances are auto- matically cut out, as the motor speeds up, by an electro-magnetic switch, the movement of which is controlled or retarded by an electro- magnetic relay in the main circuit. The switch also introduces resistance if the motor „ is overloaded. The apparatus is adjustable as to the starting and overload currents. F. Krupp Akt.-Ges., Germany (dated March 22, 1906). 20598/07. Blast furnaces. In an automatic arrangement for charging blast furnaces, a movable cap or cover is provided for the removable charging receptacle to allow of the use of a single bell. In the application of the invention to a hoist of the kind in which the charging receptacle or slip is carried, by a trolley running on an inclined track, the skip is lowered to the furnace month, and the bell is operated to dis- charge the contents, by the rotation of the trolley when the top of the track is reached. The cover is suspended by cables from segments loosely mounted on the shaft to which a drum is fixed. The segments normally bear against stops on the drum, and the cover is thus lifted with the skip when the trolley and drum are returned to position by a counterweight. When the trolley reaches the lower end of the track, pins on the segments engage curved cam-rails, which cause the segments to be rotated and the cover to be lifted automatically. The empty skip can then be refilled or unhooked from the supporting rod and replaced. In the arrange- ment shown the cover seats itself on the furnace structure; but it may be arranged so that a gas-tight joint is formed between the cover and the skip. H. Aumund, Germany. 20849/07. Drying and carbonising. A drying and carbonis- ing kiln, in which the material is carried by a conveyor upwards and downwards through a . series of chambers, is divided by means of con- striction just big enough for the conveyor to pass, into a heating compartment, a cooling compartment from which air is excluded, and a cooling compartment through which a current of cold air passes. The partitions may be hollow and provided with damped openings through which gases, steam, etc., may be with- drawn to the chimney. R. Bock, Austria. 20867/07. Dynamo-electric machines sparking, preventing. Commutating coils of alternating current machines having cross fields produced by the stator and rotor working windings, are located in certain only of the main pole fields, while the cross field in the other pole fields is unaltered. The commutating coils may be supplied with a potential proportional to that of armature in the main field or exciter, or to that of the supply or stator, or with a potential composed of proportional parts of the armature and stator potentials, regulatable separately or conjointly; or they may be short-circuited either directly or through adjustable or non- adjustable ohmic or inductive resistances. The commutating coils are preferably only excited or short-circuited when the speed of the machine approaches synchronism, and the proper period may be made dependent upon the speed of machine or upon the armature potential. Allgemeine Elektricitats - Ges., Berlin (dated September 20, 1906). 20896/07. Mine props. A mine prop consists of two flanged half tubes held together by clips and a core composed of blocks of rock or other waste material, each of which has a projecting boss at the top fitting into a recess in the bottom of the block above. The uppermost block is recessed at the top to receive a cup. Com- pressible buffers of cork, wood, shaving, straw, or like material, are placed between the blocks. The half-tubes may be removed when the prop is in place. F. Nellen, Germany. *** Copies of any of the above specifications can be supplied at the price of 15. post free. GOVERNMENT PUBLICATIONS. *** Any of the following publications may be obtained on application at this office at the price named post free. Pauperism for July, l|d. MINES AND QUARRIES, 1914: Lancashire, North Wales, and Ireland Division, 10|d.; Midland and Southern Division, ll|d.; Explosives in Coal Mines Order, 16/8/15 (No. 799), l|d. First Aid : Treatment of Minor Injuries, l^d. Railway Accidents : Summary during three months ending March 1915, Is. 5d. Factories and Workshops Lighting Report, Is. l|d. Industrial and Provident Societies’ Annual Return Forms, Nos. 14, 15, 16, 17, 18, 20, and 27, 2|d. each. Production of Food in Scotland Report, 2|d. PUBLICATIONS RECEIVED. Summary of Progress of the Geological Survey of Great Britain and the Museum of Practical Geology for 1914 (Memoirs of the Geological Survey). London : H.M. Stationery Office. Price, Is. “ Transactions of the North-East Coast Institution of Engi- neers and Shipbuilders ” (Vol. 31, Part 5), August, price 5s.; “The Naturalist,’’ September; “Annual Report of the Government Mining Engineer of the Department of Mines and Industries, South Africa, for 1914,’’ price 10s. 6d.; “ Cassier’s Magazine’’ (Vol. 48, No. 3), September, price Is.; “ The Geological Magazine ’’ (No. 615), September, price 2s. Immingham Coal Exports.—Returns for the week ending September 3 show that the coal exported from Immingham consisted of the following :—Foreign : To Dunkirk, ' 1,614 tons; and Buenos Ayres, 2,217 tons; making a total of 3,831 tons foreign, compared with 19,306 tons foreign during the corresponding period of last year. Hull Coal Exports.—The official return of the exports of coal from Hull to foreign countries for the week ending Tuesday, August 31, 1915, is as follows :—Amsterdam, 864 tons; Copenhagen, 2,567; Dunkirk, 4,717; Guernsey, 240; Gothenburg, 2,273; Harlingen, 520; Havre, 954; Oxelosund, 4,269; Rouen, 17,884; Rotterdam, 1,402; Svendborg, 1,006; Trondhjem, 101—total, 36,797 tons. The above figures do not include bunker coal, shipments for the British Admiralty, nor the Allies’ Governments. Corresponding period August 1914—total, 44,904 tons. STEEL & FILES. FANSHAWE & MARRIOTT ATKINSON, Steel and File Manufacturers, Ecclesfield, near Sheffield. Telegraphic Address: “ Fansha, Ecclesfield.” SOUND INVESTMENT. Food for your Horses prepared in half time with half labour. Installations can be seen from 5 cwt. to 5 tons per hour. Telephone- 3241 (2 lines). Telegrams—'* Elevator. Leeds.” GEORGE PORTEUS, Engineer, UBEIDS. AULD’S PATENT STEAM REDUCING VALVES Also Makers of Special FULL BORE Patent Steam Reducing Valves for Blowing, Winding, Pumping and other Engines, and for supplying Surplus or other steam from high to low pressure boilers, &c. DAVID AULD & SONS, Patentees 4* Matters, LTD. Whitevale Foundry, GLASGOW. CEMENTATION Shaft Sinking and Drift Driving through any kind of Water-bearing Measures, by Improved Patent Cement- ation and Chemical Processes. Concrete Lining a speciality. Feeders of water existing In Shafts or Levels treated. Seventeen Shafts already cemented In England In the last two years. Complete Estimates given on application. ALBERT FRANCOIS, Whitehouse Chambers, DONCASTER.