772' THE COLLIERY GUARDIAN. October 11, 1918. ABSTRACTS OF PATENT SPECIFICATIONS RECENTLY ACCEPTED. 118643. Aerial Ropeway Carriers. J. W. White, of R. White and Sons, Widnes.—The present invention relates to improvements in the gripping jaws connected to the carriages of aerial wire ropeways. In certain cases it has been suggested to arrange the gripping jaws en- gaging the haulage rope in the form of interlacing claws. According to the present invention, the jaws, where they engage the haulage rope, are of usual form, engaging the rope along their full surface, while additional interlacing fingers are applied to the jaws to .support the rope when it is not gripped by the jaws, these fingers taking no part in clamping the rope. . 118696. Tipping Wagons. W. Brown, 27, Buxton-road, Heaviley, Stockport.—This invention relates to improve- ments in tipping wagons, and has for its object to enable refuse and the like to be tipped from the rear of the wagon, which may be either hand-drawn, horse-drawn, or mechanically propelled. Various -devices and mechanical appliances have been proposed and adopted for the purpose of tipping wagons and the like, such devices including cams of various forms, cranks, eccentrics, and curved or inclined planes, but in only one instance has it been suggested to employ a device capable of being turned a full revolution. In other words, in almost every case it has been necessary to actuate the operating cam, crank, or equivalent in one direction to tilt or tip the wagon, and to reverse the direction in order to return the wagon to its normal position. In the one exception indicated it was proposed to employ a crankshaft rotated by* worm gearing and connected by rods to the tilting body, the rods being provided with spring dash pots to obviate shock and jar when the tilting body is restored to its normal position. This invention is characterised by several features which distinguished it from the forego'ng arrangement. For example, instead of the crank shaft and connecting rods are substituted hollow cams, which engage studs fixed on the underside of the inner pivoted body, which is contained within an outer casing or shell body. In carrying the invention into effect, upon an under frame or chassis is mounted a suitable body with two sides and one end, around which is a casement or another shell body, and at the front end of the frame* at each side is a hollow cam on a shaft extending trans- versely across the frame. The ends of the shaft are journalled in the sides of the frame, so that when the shaft with the hollow cams is rotated, the body is raised or lowered in position to the required angle to tip any material contained therein. When, instead of a hand or horse-drawn tipping wagon, a steam or internal combus- tion motor is used to drive the wagon, the tipping, mechanism above described may be geared to and actuated from the engine or motor in any suitable and convenient manner. (Three claims.) 118730. Extraction and Fractional Distillation of Oils from Coal Gas. Desire Marbais, 4, Quai aux Grains, Charleroi, Belgium (at present residing at 2, Rue Blanche, Paris, France, and C. Deguide, 100, Avenue Louis Lepoutre, Ixelles, Belgium, at present residing at Rue Marniere, Outreau, Pas-de-Calais, France.—The present invention has reference to the extraction of oils from coal gas. It relates to a process for effecting, during continuous working and starting from poal gas, the, ex- traction, the recovery and separation or fractional distil- lation of three spirits or oils, clearly classified, and capable of being immediately sold and utilised commer- cially. The first of these, composed of benzol or benzene, proceeds to distillation in the proportion of 90 per cent, at 100 degs. Cent. The second of these, and termed “ toluened spirit,” that is to say,, a mixture of benzol, toluol and xylol, proceeds to distillation in the propor- tion of 50 per cent, at a temperature of 100 degs. Cent. The third, termed “ heavy spirit,” comprises a spirit or oil of the type “solvent naphtha” and white naphtha- lene. The process consists essentially of three successive phases or stages: the debenzolage of the coal gas by the liquid absorbing the benzol; the recovery of the benzol by distillation, by the aid of steam, from the liquid which is charged with the benzol in the preceding stage; the rectifying and the fractioning or separation of the benzol into three spirits or oils, this last stage or phase forming the characteristic novel feature of the invention. 118781. Centrifugal Compressors. British Thomson- Houston Company Limited, 83, Cannon-street, London, E.C. (a communication from the General Electric Com- pany of Schenectady, New York).—The present invention relates to centrifugal compressors, and particularly to an arrangement for preventing pulsations when the com- pressor is operating at light loads. It is well known pulsations may be prevented by wasting air from the discharge side of the machine or by passing it from the discharge side to the inlet side, and one object of the invention is to provide an improved automatically operating valve mechanism for this purpose. A, further object of the invention is to provide, in connection with such a valve, a flap valve which serves to operate such, valve mechanism and also' as a non-return valve to prevent fluid from being forced, backwards through the compressor, which may occur, for example, in the case of a plurality of* machines operating in parallel. (Three claims.) 118805. Signalling Apparatus for Automatic Telephone System. A. E. Stevens, 188, Alabama-avenue, Providence, Rhode Island.—This invention is described, but not claimed, in Application No. 118691 for Letters Patent for automatic telephone system filed September 14, 1917, of which the present application is a division. The inven- tion relates to that class of automatic telephone systems primarily designed for private installation and limited in the number of possible connections, and has for its object means whereby all stations may be automatically simul- taneously signalled from any station, and whereby such other results may be obtained as may hereinafter appear. (Two claims.) 118828. Electric Signalling Systems for Use in Mines. Automatic Telephone Manufacturing Company Limited, Milton-road, Edge-lane, Liverpool, and C. Remington, 13, Oakhill-road, Old Swan, Liverpool.—This invention relates more particularly to such systems as are used for signalling the various orders from the onsetters to the man in charge of the winding engine in coal and other mines. In electric signalling systems for use in mines it is usual to provide a series of signal lamps, controlled by a chain of controlling relays, which relays are actuated successively by impulses transmitted by a master relay. Each relay carries two windings, an operating and a retaining winding, the former receiving the impulses from the master relay to energise the relay, the circuit of the retaining winding being then closed to retain the relay energised. The circuits of these retaining windings are controlled by a pair of signal cancelling relays which are operated by current from a small dynamo driven from the shaft of the winding engine. The contacts of these cancelling relays are so arranged and interconnected with the retaining windings of the relays that certain signals, such as “ action ” signals are cancelled upon commence- ment of operation of winding engine, while other signals such as the “destination” signals, are retained in opera- tion until the end of the wind. Such a system is fully described in the specification of a co-pending Application No. 12199-of 1917. In systems of the character outlined above, the first action signal—that is, the signal operated by the energisation of the first relay of the chain—has consisted of two distinct orders, namely, “ raise ” and “stop,” the engineman acting upon this signal either to raise the cage if it is at rest, or to stop it if in motion. It is desirable, in order to eliminate the possibility of confusing the engineman in the operation of his engine control gear, to arrange that only one of these signals shall be given at a time, the “ raise ” signal when the engine is at rest; and the “ stop ” signal when in motion. It is the object of the present invention to provide a simple arrangement for accomplishing this result, and to this tend, according to the invention, two separate panels are provided, one containing the “ raise ” signal and the other the “ stop ” signal, the circuits of the lamps of which are so controlled by the controlling relays of the appa- ratus that only one of these signals is operated at any time, the “ raise ” signal when the engine is at rest, and the “ stop ” signal when in motion. The circuits of the two signal lamps are controlled by one of the usual pair of cancelling relays, which relay will be energised or de-energised when the engine is operating or at rest respectively. This relay, upon energising, operates to prevent the closing of the circuit of the “raise” signal lamp and to prepare the circuit .of the “stop” signal lamp. (Four claims.) HEW PATENTS CONNECTED WITH THE COAL AND IRON TRADES. Applications for Patents. September 30 to October 5 {inclusive). [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.] , Akam, J. W. Apparatus for burning sawdust, etc., for heating purposes. (16213) Alexander, W. H. J. Fire bridges and hollow fire bars for furnaces of boilers. (16050) Babcock and Wilcox. Apparatus for screening coal, etc. (16119) Barclay, T. and T. K., Bruce,, W. S., and Lamb, H. T. Steam generators, etc. (16011) Basset, L. P. Manufacture of iron and steel from ore. (16034) Bedford, C. S. Drying vegetable and animal matter for fuel, etc. (15990) Bird, C. K. Internal combustion engines. (15947) Bury, A. F. and E., and Ollander, 0. Recovery of gaseous products from plants for destructive distilla- tion of organic materials. (16121) Connolly, M. Internal combustion self-generating steam turbine. (16196) Crossley, R., and Wilson, A. Pumps, compressors, etc. (15887) Donaldson, J. Apparatus for handling coal, ore, etc., on shipboard. (16062) Evans, D. Coal substitute. ’ (15991) Eyre Smelting Company. Liquid fuel burners. (16151) Henery, J. Cranes, etc. (16205) » Henry, J. T. Mechanical motor. (16143) Kingsland Research Syndicate and Torazzi, M. F. Safety winches, etc. (15949) Kirke, P. St. G. Operating steam generators. (16027) Langdon, A. G. Rotary pump. (15910) Lennox, A. Apparatus for screening coal, etc. (16119) Maina, J. Internal combustion engines. (16114) Mavor, D. Twin rotor engine. (16063) Morterud, E. Flow condenser, and method of operating ' same. (15960) Pearse, H. Liquid fuel burners. (16151) Pickard, E. Hot air and smokeless furnace. (16079) •Poore, P. Destructive distillation of wood, etc. (15933) Poore, P. Conveyors. (15937) Poore, P. Apparatus for destructive distillation of car- bonaceous substances. (15938) Poore, P. Destructive distillation of wood, woody fibre, etc. (15939) Price, W. A. Dynamo-electric machines. (15953) Rafn, R. Belt conveyors. (15894) Reede, A. A. W. van. Air pumps for condensing plants. . (15973) Reid, J. Furnace fronts, and adapter rings therefor. (16105) Robinson, J. G. Steam superheaters. (16211) I Scholes, E. H. Steam generators. (16163) Smith, R. J. Water tube boilers. (16104) Sperry Gyroscope Company. Visual indicating devices. (.16029) Tickle, R. J. Turbines, etc. (15923) Wright, A. Clinometers. (15929) Complete Specifications Accepted. (To be published on October 24.) [Note.—The number following the application is that which the specification will finally bear.] 1917. 12138. Musker, A. Discharge of cargo in bulk front barges or vessels. (119263) 13652. Topham, W. Regenerative gas furnaces. (119273) 13739. Vickers Limited and McKechnie, J. Two-stroke internal combustion engines. (119275) 13797. Carey, R. F. Hydraulic machines for the trans- mission of power. (119276) 13938. Be^g, A. L. W. Conveyors. (119283) 14838. Kievits, J. E. P., and Kynoch Limited. Method of construction of electric furnaces of the heated coil type. (119302) 15075. New Rotoplunge Pump Company, Smith, C. Lakin-, and Beckwith, N. G. Pumps. (119307) 15121. Cairns, A. True vertical indicators. (119308) 15604. Busby, G. E. Power-creating or self-driving plant. (119312) 18857. Fedden, A. H. R., and Brazil, Straker and Com- pany. Internal combustion engine. (119356) 19248. Ross, A. F., and Forsyth, T. Means for fastening tokens or tabs to coal or other hutches, corves, and such-like. (119362) 1918. 1042. Burdons Limited, Burdon, W. M. M. Liquid fuel burners. 1247. Birrell, W., and Donaldson, J. steam boilers. (119377) trie Company). (119379) 2828. .Huntley, G., and Vivian, R. ‘ ratus. (119389) 3001. Alexander W., and Halliday, internal combustion engine. 4588. Pickard, W., and Dobson, D. producing oil gas. (119399) ‘ ~ ’ Internal combustion engines. M., and Burdon, (119376) Marine and other 1334. British Thomson-Houston Company (General Elec- v Centrifugal compressors. E. Hoisting appa- G. F. Two-cycle (119390) R. Apparatus for 4816. Davidson, J. (119401) 6230. Simpson, C. W. or retorts for (119413) 6416. Davidson, J. (119414) 6905. Holmes, D. W., apparatus for (119415) 7813. Does de Bije, A. (115644) 12788. Soc. Anon, des Produits Refractaires de 1’Ouest. Manufacture of silica bricks. (118116) Complete Specification open to Public Inspection before Acceptance. Heating flues of chamber ovens; producing gas and coke or fuel. Internal combustion engines. and Lewis, H. J. Appliance or mine cages, lifts, and the like. J. M. A. R. van der. Furnaces. [Note.—The number following the application is that which the specification will finally bear.] 1917. Day, D. T., and Day, R. B. Vaporising hydro- carbons and producing hydrocarbons having low boiling points from hydrocarbons having high boiling points. (119440) Day, D. T., and Day, R. B. Treatment and re- fining of hydrocarbon materials. (119441.) 16899. 16900. 1918 7528. Lamberty, P. Manufacture of briquettes. (119443) 13151. Sarramea, H. Bath for electrolytic tinning. (119451) 14172. Choquet, L. Rotary internal combustion engine. (119453) 14721. British Westinghouse Electric and Manufacturing Company. Steam condensers. (119461) PUBLICATIONS RECEIVED. Chemical Engineering and Mining Review (Vol. 10, No. 118), July, 1918; The Journal of State Medicine (Vol. 26, No. 10), October 1918 (The Royal Institute of Public Health, 37, Russel-square, London, W.C. 1), price 2s. net; The M. and C. Apprentices’ Magazine (Vol. 2, No. 7), October 1918 (The Journal of the Apprentices Employed at the Works of Messrs. Mavor and Coulson Limited, Glasgow), price 3d.; United States Bureau of Mines, Department of the Interior: Technical Paper 162, Initial Priming Substances for High Explosives, by Guy B. Taylor and W. C. Cope; Technical Paper 172, Effects of Moisture on the Spontaneous Heating of Stored Coal, by S. H. Katz and H. C. Porter; Bulletin 103, Mining and Concentration of Carnotite Ores, by K. L. Kithel and J. A. Davis; Bulletin 137, The Use of Permissible Explosives in the Coal Mines of Illinois, by James R. Fleming and John W. Koster; Fuel Economy in Cooking Apparatus, by A. H. Barker (reprinted from The Builder, and published by The Builder Limited, 4, Catherine-street, Aldwych, W.C. 2), price Is. 6d. net; The Naturalist (No. 741), October 1918 (London: A. Brown and Sons Limited, 3, Farring- don-avenue, E.C. 4); Journal of the Franklin Institute (Vol. 186, No. 3), September 1918, single number 50 cents; The South African Journal of Industries (Vol. 1, No. 12), August 1918, price 6d. CATALOGUES AND PRICE LISTS RECEIVED. Ed. Bennis and Company Limited, 28, Victoria Street, Westminster.—Bennis installations have given so much evidence of efficiency in prolonged operation that the cata- logue relating to Bennis truck unloaders is sure to com- mand special interest as a contribution to economy in coal handling. Attention is directed to labour-saving, quick-, ness, and the increase of railing capacity ensured by these unloaders, of which the truck tippler, as installed in gas works, i^ a well-illustrated example. The firm’s dis- chargers are being used successfully for cbal, iron ore, copper ore, cement, and many other heavy products. They are well adapted for any material which will not flow out of the truck in the ordinary way. Other features deserv- ing of notice are the Bennis mechanical stokers and com- pressed air furnaces, U-link steel chain conveyors, inclined ^sh tipping hoist, bunkers, etc., all of which have an important bearing upon the maximum output of work. The firm’s publicity department will be pleased to supply a copy of the catalogue to any enquirer. Institution of Petroleum Technologists.—A meeting of the institution will be held in the house of the Royal Society of Arts, John-street, Adelphi, London, on October 15, commencing at 5 p.m. A paper on “ Some Notes on the Geology of the Persian Oil Fields,” by Mr. H. G. Busk and Mr. H. T. Mayo, will be read. Coal Controller on the Coal Shortage.—The Coal Con- troller reports that the shortage of coal in Great Britain is far more serious than at any time since August 1914. Two months ago the situation was acute; to day it is more acute. Stocks of coal throughout the country are lower that they were then, whereas at this period of the year they should be at their highest. Munition works in various parts of the country are short of coal, and are closing down in some cases for one day a week. Scotland is very short of coal. Glasgow is complaining of short- age in many districts. In the Midlands and Yorkshire the conductors of munition and general industrial work are crying for coal which cannot be supplied to them. Special efforts have been made to supply railways, but without success. The only ground for satisfaction is that miners, coal owners and managers in many districts are showing a disposition to make bigger efforts to increase output, and there are indications that householders have made up their minds to keep down the consumption of coal, gas and electricity to the lowest point. Industrial works are also appreciating the necessity for the most economical use of fuel.