300 THE COLLIERY GUARDIAN. February 5, 1915. held at its middle, so that the two halves of the spring have a bending strain put on them. The middle of the string or hair is wound two or three times round an axle or spindle carrying a pointer, which, when a permanent record is to be obtained, may carry a marking or inking device. Where not used for recording, the pointer may be arranged to travel over a disc or dial having percentages marked thereon. According to the invention, multiplying and indicating and recording parts are all carried by the same frame or carrier, and where there are no recording parts, the multiplying and indicating parts are carried by the same frame or carrier. In the former case the frame is carried by a screw at its lower end passing through a nut rotatable in the base piece, the nut being provided with a milled head below, i.e., outside the base piece. The frame is prevented rotating by a plug piece a 2 at c nt' i at its upper end fitting in a fixed socket having a square socket hole or provided with a key and key way device. In the latter case the frame is suspended from the case or piece containing or carrying the porous vessel and diaphragm by a screw, so that by rotating the frame or carrier from which the screw projects the multiplying and recording parts are brought nearer to or moved further away from the diaphragm, causing a corresponding alteration in the posi- tion of the pointer. This is also the effect of rotating the milled head in the first-mentioned method of carrying the frame. In this manner the instrument can be adjusted to bring the pointer to-the zero mark when required, i.e., just before taking a fresh reading or observation. The multi- plying mechanism, diaphragm, and recording and indicating devices are preferably enclosed in an airtight glass case. Figs. 1 and 2 are vertical sections showing two forms of apparatus; fig. 3 shows the bellows form of the diaphragm. (Four claims.) 28982 (1913). Improvements in Gripping Devices for use with Aerial Ropeways, Gable Tramways, and the like. J. W. White, of Strathdene, Woolton, Liverpool.—Consists in an improvement in that type of arrangement in which a travelling carriage has a depending bar provided with a fixed jaw to engage the haulage rope, a sleeve carrying the bucket or load being mounted to slide around said depending bar, and in its downward movement to force the free end of the u o o o 9 pivoted jaw into engagement with haulage rope. According to the invention the outer end of the pivoted jaw is arranged to be quite free, and to be normally drawn out of the engaged position with the haulage rope by means of a spring or the like, and to be forced into the engaged position with the haulage rope by the sleeve engaging in its downward move- ment the outer end of the pivoted jaw. Fig. 1 is an end elevation of one form of construction; fig. 2 is a partial side view of the same. (Two claims.) PUBLICATIONS RECEIVED. The Practical Engineer Electrical Pocket Book and Diary, 1915. London: The Technical Publishing Com- pany Limited. Price, Is. 3d. The Practical Engineer Pocket Book and Diary, 1915 (Mechanical). London : The Technical Publishing Com- pany Limited. Price, Is. 3d. Report of the Department of Mines of Pennsylvania, 1913 (Pa^t I.—Anthracite; Part II.—Bituminous. Harrisburg, Pa. : Wm. Stanley Ray. The Engineer’ Afloat. By F‘. Butterworth. London : Technical Publishing Company Limited. Price, Is. 6d. “ Journal of the Royal Statistical Society ” (Vol. 78, Part 1), January, price 5s.; “ Temperance Taxation and Housing Reform,’’ also “ The Church of the Future,’’ by T. P. Ritzema (Blackburn : The Northern Daily Press); “ Journal of the South African1 Institution of Engineers ” (Vol. 13, No. 6), January, price 2s.; “ The Iowa Engi- neer,’’ January; “Resources of Tennessee’’ (Vol. 5, No. 1), January; “The Journal of State Medicine,’’ February, price 2s. NEW PATENTS CONNECTED WITH THE COAL AND IRON TRADES. Applications for Patents. 1155. Brakes for trailer trucks or wagons. A. G-. Edwards. 1156. Chain grate mechanical stokers. M. Hurd. 1166. Deep well pumps. F. C. Russell, A. E. Russell, and A. M. Russell. 1173. Tilting electric furnace for melting and refining metals. F. Bassanese. 1184. Ambulance stretchers. J. I. Emery. 1188. Method for removing pit props or .supports in mines and apparatus therefor. F.-Sommer. 1193. Slag removing and indicating mechanism for open hearth furnaces. W. A. Kosinski and P. P. Rhode. 1206. Process for treating coal and other material. L. P. Burrows. 1210. Devices for connecting ropes, cables, or the like. F. A. Bullivant and G. M. Selby. 1213. Manufacture of steel. F. T. Snyder. 1230. Furnaces for hardening, for annealing, for melting metals, and for other like uses. I. Hall. . 1245. Boring bars. H. B. WTedgwood. 1254. Automatic coupling for railway wagons and like vehicles. C. W. Crossley. (G. W. Ettenger, Belgium.) 1274. Fluid operated percussive drills. W. J. Mellersh- Jackson. (Ingersoll-Rand Company, U.S.A.) 1287. Wafer tube boilers. W. Schmidt. 1318. Method of and means for closing the ends of boiler and like tubes. W. Evans. 1331. Rotary disintegrating, pulverising, or mixing appa- ratus. J. W. Spensley. 1340. Central station generating plant. British Thomson- Houston Company Limited, F. H. Clough, and F. Samuelson. 1345. Furnaces. E. J. Ison and W. W. Watts. 1349. Water tube boilers. J. P. Davies. 1351. Furnace firebars. D. W. Thomas, J. Lewis, and D. Morgan. 1387. Boiler and like furnaces. W. H. Holehouse. 1398. Fire bridges for boiler furnaces and the like. J. P. Tye. 1415. Single rope or chain grabs. S. H. Priestman and R. Wright. 1433. Iron tongue-and-groove piling and beams. Deutsch- Luxemburgische Bergwerks- und Hiitten Akt.- Ges. 1439. Earth borer. W. Watson and F. W. Bromley. 1448. Mine props. E. Mills. 1453. Mercury globule electrical contact maker, for releasing mine winding signal indicators, actuating indicators of the stopping, starting, and reductions of speed of machinery and the like. G. Saint. 1457. Method of shearing metals or other materials in sheets, bars, or other-form. C. Smith. 1460. Wagons or trucks. J. T. Hardaker. 1469. Wire rope grips. Davey and Company (London) Limited, and A. C. Davey. 1484. Rock drilling machines. W. C. Stephens. (F. T. Carthew, Transvaal.) 1489. Method of treating tar or tar oils or derivatives of tar, for the purpose of converting hydrocarbons - having a high boiling point into hydrocarbons of low specific gravity and with a low boiling point. M. Melamid and L. Grotzinger. 1490. Method of obtaining products of tar distillation which boil at a low temperature by heating along wTith phosphoric acid. M. Melamid and L. Grotzinger. 1494. Pumps, engines, and the like. J. Zwicky. 1503. Centrifugal pumps and blowers. S. H. Adams and C. H. Adams. 1520. Miners’ electric safety lamps. C. H. Elliott and G. Barstow. 1525. Construction of electric batteries. H. F. Joel. 1527. Machines for bending metal sheets and for like purposes. H. F. F. Sedgwick. 1538. Boilers. A. Winands. 1539. Method of and means for raising the pressure of steam and other gases capable of being condensed. W. O. Pepper, W. A. Crowther, and J. A. McClay. Complete Specifications Accepted. (To be published on February 18.) 1913. 24038. Method of and means for the centrifugal separation of solid substances from liquids. Hughes, Travis, and Sturgeon. 24491. Process for the production of motor spirit from heavy hydrocarbons. Hall. 29630. Buffers for railway and like vehicles. Spencer. 29756 and 29757. Electric cables. Watson, and Callenders Cable and Construction Company. 1914. 2063. Electric battery lamps. Turquand. 2247. “ Keps ” for pit cages and the like. Davies. 2305. Rock drills. Thornton (Cleveland Rock Drill Com- pany.) 2692. Boring tools and the like. Stanley. 3124. Method of and means for manufacturing weldless coupling chains for railway vehicles* .Wilson. 4696. Graders for coal, coke, and the like. Allison. 7241. Signalling apparatus, more especially for use in , , . collieries. John Davis and Son (Derby) Limited, and Davis. 8317. Haulage clips for rope haulage railways. Button. 12789. Rope lifter for haulage systems in mines. Lister. 17360. Handles for spades and other tools. Skelton and Skelton. 18789. Means for securing railway rails to sleepers. Miller. 20386. Miners’ safety lamps. Prestwich. Complete Specifications Open to Public Inspection Before Acceptance. - 1914. 24162. Steam generators. Soc. J. and A. Niclausse. CAPTURING ENEMY PATENTS. 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, 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 Register of Patents. If any patent listed has been assigned to a non-enemy proprietor, the law does not apply. 5852/12. Gas producers. Relates to the process for the generation of steam for gas generators, in which hot gases are brought into direct contact with water and the resulting mixture of gases and steam, together with air, is conveyed to the gas generator, and consists in producing the hot gases by the combustion of gas other than that from the gas generator. Suitable gases are blastfurnace gas, coke oven gas, and water gas. Hot gases obtained from the combustion of solid fuel other than that in the gas generator or from liquid fuel may be employed. The mixture of hot gases and steam are superheated by being admixed with further hot gases before being passed to the generator. H. Frambs and Bender and Frambs Ges., Germany. Addi- tion to 17770/11. 5867/12. Furnaces; rotary furnaces; tuyeres. P. Pfeifer, Berlin. 5923/12. Stoves; closed solid fuel stoves. J. Wetzl and J. Petho, Hungary. 6202/12. Rock drills. The percussion drill is pivotally mounted on a part adapted to slide on the sup- porting lever, and the crown of the drill is adapted to be thrown back from the face of the rock or the like by resilient means. J. Kubat, Bohemia (dated September 19, 1911). Addition to 24553/11. 6462/12. Granulating slag. Molten blastfurnace slag is sprayed against an internal perforated surface, and chilled by jets of water, etc., which issue from the perforations. The slag is supplied by a shoot to one end of an inclined drum, and is disintegrated and thrown against the perforated walls by propeller-like blades or beaters. These blades may be hollow and perforated for the purpose of supplying additional water jets. The drum may be mounted to rotate within a stationary drum, or both drums may be rotated together, and the water, etc., is supplied to the annular space between the drums. Pipes supply lime or other material to improve the quality of the cement produced. Another form of spraying device comprises a prismatic hollow body with perforated sides the body being arranged within the drum, and the slag being distributed over its upper edge; or a jet nozzle may be used to spray the slag into the drum. C. Walter, Germany. 6674/12. Furnaces; air supply, regulating; air, supplying; linings; fire bridges. In a supplementary air supply apparatus set in action by the move- ments of the fire door and controlled by adjust- able clockwork, the air valves are retained closed during the opening of the fire door, and while it remains open, and are opened only on closing the fire door. A steam supply with a distributing arch above it and a special con- struction of furnace lining, with air valves arranged therein, form subsidiary features. H. Kowitzke, Berlin. 6907/12. Gas producers, etc., grates. In a rotary grate for gas producers, etc., the fuel surface comprises plates arranged in a fan-like manner, the level of each plate gradually rising rearwards from its leading edge in such a manner that, between consecutive plates, a wedge-shape slot or open- ing narrowing towards the centre of the grate is formed, through which the blast is supplied in increasing quantities towards the circum- ference of the grate. Deutsche Huttenbau Ges., Germany (dated May 20, 1911). 6908/12. Gas producers, etc.; grates. Relates to revolving grates for gas producers, etc., of the kind in which the lower portion of the grate is provided with members for breaking and removing the ashes and clinkers, and consists in providing upon a number of superposed rings, connected together by flanged joints, and surrounded by a conical structure, vertical ribs, to which are secured detachable ash breakers or sweepers provided with strengthening ribs. Deutsche Huttenbau Ges., Germany (dated July 8, 1911). 7663/12. Rotary pumps; discharge pipes for pumps, pack- ing drums, etc. Siemens - Schuckertwerke, Berlin (dated April 1, 1911). *** Copies of any of the above specifications can be supplied at the price of Is. post free. GOVERNMENT PUBLICATIONS. *** Any of the following publications may be obtained on application to this office at the price named post free. Statutory Rules, 1914 : (Nos. 22 and 23), Trading with the Enemy, l£d. each. Foreign Trade and Commerce up to January 18, 1915, 4d. Pauperism (England and Wales); Statement for December - 1914, 2d. List of Authorised Explosives, January 1, 1915, 2Jd. Registry of Shipping, December 1914, 3Jd. Hull Goal Exports.—Exports of coal from Hull for the week ending Tuesday, January 26, were :—Amsterdam, 355 tons; Aarhus, 1,707; Alexandria, - 3,540; Boulogne, 659; Buenos Ayres, 4,529; Christiania, 379'; Calais, 3,949; Dunkirk,1 965; Falkland Islands, 4,592; Genoa, 6,901; Gothenburg, 970; Harlingen, 155; Helsingborg, 1,208; Havre, 3,308; Naples, 1,635; Oxelosund,51,161; Porsgrund, 200; Port Said, 2,596; Palermo, 502; Rotterdam, 103; Reykjavik, 512; Rouen, 9,159; Santos, 3,899; St. Nazaire, 3,308; Tonsberg, 564; and Treport, 612—-total, 57,459 tons. The figures do not include bunker coal shipments for the British Admiralty nor the Allied Governments. For the corresponding period of 1914 the total was 42,769 tons.