782 THE COLLIERY GUARDIAN April 20, 1917. i3 the relay coil f1 will not now be connected across the line, so that contacts f1 will be again closed, and the contactor e will close, thus allowing the motor to run in the “reverse” direction.' On reaching the limit of its travel in this direction, the limit switch arm would be knocked to the position where it would make contact on c, and in this position the relay coil r1 would be connected again across the line, the controller being in the “ reverse ” direction. (Two claims.) 104546. Improvements in or Relating to Pumps or Com- pressors. A. E. L. Scanes, Strathfield, Harboro’-road, Ashtori-on-Mersey, Chester.—In the specification of Letters Patent No. 7443/15, the applicant has described an improvement in air, gas, or vapour pumps of the kind. utilising a liquid in the form of a jet, spray, or the like, as the working medium, such improvement consisting in utilising for the working medium a closed seal tank, having a restricted outlet through which alone the 'gases or vapours compressed by the pump and liberated from the liquid in the tank can escape, 'the size of the restricted outlet being varied automatically in accordance with the difference between the pressure fin the seal tank and that at the air or gas suction of the pump. The size of the restricted outlet from the closed seal tank is varied by a valve device subjected to the opposing pressures existing at the air inlet of the pump, and within the seal tank. Whilst in operation, water from any convenient source is continu- ously admitted to the tank for making up any loss occurr- ing during the operation of the pump, and also for pre- venting an undue rise of temperature of the water in the tank. The water in the tank is maintained at the desired level, notwithstanding .the make up or cooling water admitted thereto, by means of an overflow valve con- trolled by a float in the tank itself, or a valve chamber in connection therewith. The present invention consists in a modified form of the apparatus constructed as aforesaid, according to which the .................................overflow valve, instead of being _ controlled by a flbat, is ^controlled by a • pressure operated valve device subjected to the opposing pressures exist- ing in the tank and at the air or gas inlet of the pump. The size of the restricted outlet from the tank, through which the gases or vapours com- pressed by the pump and liberated from the liquid in the tank escape-to the atmosphere, is governed by a valve or the like, Operated in accordance with the level of the water, in the tank, for example, by a float in the tank or in a float chamber in connection therewith. The single figure of the accompanying drawing illustrates diagrammatically, by way of example, one way in which the modified form pf the invention may be carried into effect. The operation is as follows :—The pressure- operated valve device 12 is so adjusted that when less than a predetermined difference exists between the. pressure in the seal tank 4 and that at the air suction 18 of the pump 16, the overflow valve—in this case the piston 21 of the valve device shown in fig. 3 of the specification of a prior patent—is actuated to reduce the flow of water through the pipe 28 from the tank. The level of the water in the seal tank 4 thereupon rises, and causes the float-controlled valve 25 to restrict the size of, or close altogether, the outlet 30 for air and gases from the tank. The pressure in the tank accordingly builds up until it reaches a degree at which the valve device 12 causes the overflow valve 21 again to open, and allow a greater overflow of water from the tank 4 through the pipe 28 and outlet 11 of the valve device. The level of the water in the tank 4 then com- mences to fall, and the float-controlled valve 25 opens or increases the size of the restricted outlet 30, so that a further increase in the pressure in the tank 4 is prevented. The valve device 12 governing the overflow of water from the tank 4 and the float-controlled valve 25 thus co-operate to maintain the desired difference between the pressure in the closed seal tank 4 and that at the suction 18 of the pump 16.. (Two claims.) 104780. Improvements in Driving Belts. N. B. Roy, Netherton Works, Anniesland, Glasgow.—The subject of this invention is a textile driving belt, to which, for the pur- pose, inter alia, of imparting thereto an improved finish, there is applied a solution having a basis of acetyl cellulose. 104842. Improvements in Purifier for Compressed Air. C. L. Burdick, 4, Eastern-road, Wood Green, London, N. __This invention relates to improvements in apparatus for purifying compressed air and removing foreign particles, such as dust, oil, or water, therefrom, and is designed for use where compressed air is used for spraying paints, liquids, or powder, and where moisture or dirt would interfere with the practical working of such methods. The apparatus is so designed that while serving as a screen for the air, it will also act as a trap for water, to prevent it being carried on by the current of air, the water being trapped by the action of gravitation. The apparatus com- prises in-combination parts arranged for the purifying, of compressed air for spraying or dusting apparatus consist- ing of an inlet and outlet fitting, with an extension from which are suspended "a screening device and a receptacle to intercept or trap liquids. An adjusting valve is pro- vided to control the flow of air, and a draw-off tap. for convenience in removing water. Fig. 1 is a vertical sec- tional side view; fig. 2 is a sectional view atjr—x (fig. 1) looking in the direction of the arrow ; fig. 3 is a sectional view at y—y (fig. 1) looking in the direction of .the arrow. Referring to figs. 1 and 2, a is a cylindrical piece, which may be threaded interiorly or exteriorly, at the ends , to receive a 'pipe or pipes conveying the air; an extension from the side of a is provided with a. cylindrical cap b, the extension is also further provided with a threaded disc or flange c positioned within the cap ; this extension with cap and flange is intended to receive and support a cylin- drical cup-shaped piece e within which the screening device is disposed. The cup e, by being positioned below the conduit pipe, forms a trap for catching and retaining water. The screening device consists of a cylindrical cup- shaped piece /, preferably of metal, either made of woven wire or of perforated sheet metal; it serves as a support for, an interior bag g, preferably made of woven fabric, through which the ■ air is made to pass. As it'will be desirable to remove this bag at intervals for cleaning, a spring ring h is provided, which may be made in half- section where the ends meet and pass, to give it flexi- bility, which will be placed in the mouth of the bag, and sprung into a groove in the piece z, gripping the bag and holding it in place. The ring-shaped piece i has an interior thread, by which it is removably secured to the flange c, and it is rigidly secured to the pieces / and e, and when firmly screwed into place brings the rim of the 7 vzr cup e against a packing ring k grooved into the cap b ; a nut s is provided so that a spanner may be used for secur- ing pressure of the rim on the seating to prevent escape of air. The piece i is provided with a number of holes or passages j, through which the screened air passes on to the passage q, and so to the conduit pipe or outlet. A draw-off tap t may be provided to remove water from e without removing the entire part. The part a is pro- vided with a tap m—n, which controls the inlet of air through the passage o to the screening mechanism. The action of the apparatus is as follows :—Air being admitted through the tap m—n will pass through the passage o and the screening bag g and the perforated cylinder f and out through the passages j and q into the conduit pipe. Any particles of dirt will be retained within the bag, and if there is a deposit of water it will be retained in the cup- shaped piece e, and may be drawn off at twhen the bag g becomes choked with dirt, it may be quickly removed and a clean bag inserted. (Six claims). NEW PATENTS CONNECTED WITH THE COAL AND IRON TRADES. Applications for Patents. [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.] Beardmore, Sir W. Water jacketted engine cylinders. (5114) Bregeat, J. H., and Daniel, A. Process for recovery of ether, alcohol, benzine, or / and acetone from gaseous mixtures. (5089) British Thomson-Houston Company (General Electric Com- pany). Electric regulators. (5292) British Westinghouse Electric and Manufacturing Com- pany. Systems of control for single phase commu- tator motors. (5168) British Westinghouse Electric and Manufacturing Com- pany (Westinghouse Electric and Manufacturing Com- pany). Control of dynamo-electric generators. (5301) Cairns, H. S. Fishing tools for well boring. (5207) Chippendale, A. Steam traps. (5294) Chitty, H. Electric machines. (5178) Cruse, H. Steam generators. (5171) Davy Brothers. Steam hydraulic intensifiers. (5184) Deering, P. S. Cam shafts for internal combustion engines. (5211) Dexter, J. W. Combined percussive and disc coal cutter. (5218) . . (Donaldson and Fisher Company). Power transmission mechanism. (5226) Douglas, T. Governors. (5136) Dowson, R. M. Rotating cylinder internal combustion engines and compressors. (5264) Etchells, H., and Greaves, H. A. Electrically heated resis- tance furnaces. (5072) Euler, C. F. Gas generators. (5272) Fairweather, H. G. C. (Aktiebolaget Ingeniorsfirman G. A, Lindstedt and Company). Differential pressure gauge (5042) Foxley, M. G. Y. Internal combustion engines. (5010) Francis, D. H. Internal combustion engines. (5147) Gordon, F. F. Manufacture of steel. (5262) Hadfield, Sir R. A. Manufacture of steel. (5048) Hall, I. Melting furnaces. (5216) Hamilton, J. Apparatus for .continuous fractionation and dephlegmation of petroleum or other hydrocarbon dis- tillates or mixture of volatile liquids. (5004) Hand, T. W. Steam hydraulic intensifiers. (5184) Heinrich, H. Rotary engines, pumps, etc. (5100) Heyl, G. E. Process of obtaining a distillate from shale free from sulphur. (5081) Hjort, V. F. Apparatus for softening or purification of water. (5082) Holden, A. Mechanical stokers. (5284) Hook, G. D. Valve for compressed air, etc. (5247) Hovland, H. B. Apparatus for treating ores, etc. (5174) Hunt, W. H., and Macintosh, A. A. Equalising or main- taining an equilibrium or any predetermined condition of pressure in retorts or offtake pipes in manufacture of coal gas or volatilisation of other suitable sub- stances. (5037) Hutsons Limited (McLlenahan, H.). Piston rings and rod, etc., packings. (4969) < Lassen, J. J. Apparatus for softening or purification of water. (5082) Marks, E. C. R. (Soc. Franco-Beige de Fours a Coke). Regenerators for coke ovens. (5255) Mellor, F. Recovery of sulphate of ammonia from pro- ducer, etc., gases. (5096) Montgomery,, P. W.; Two-cycle-stroke internal combustion engine. (5033) Morison, D. B. Steam condensers. (5307) Morris Limited, H. Junctions or switches of runways, mono rails, telphers, etc. (4978) Parker, N. J. Multi-stage compressors. (5043) Pool, H. L. Percussive rock drills. (5210) Poore, P. Destructive distillation of wood, etc. (5269) Proctor Limited, J. Mechanical stokers. (5284) Pullinger, T. C. W. .Water jacketted engine cylinders. (5114) Purser, A. Valve for compressed air, etc. (5247) Redrup, C. B. Means for converting reciprocating into rotary motion, and vice versa. (5090) Roberton,' I. Oil burning appliances for furnaces, etc. (5230) Rollason, A. Manufacture of refractory materials from limestone, dolomite, and magnesite. (4995) Scott, A., Sleator, E. W., and Wallace, M. L. Apparatus for stopping driving mechanism on breaking of trans- mission rope, belt, or chain. (5203) (Soc. Franco-Beige de Fours a Coke). Regenerators for coke ovens. (5255) Sulman, H. L. Destructive distillation of wood, etc. (5269) Symons, E. B. Crushing machines. (5061) Thomson, R. W. M. Electrical current or voltage regu- lator. (5005) White, F. Extraction of oil from shale, etc. (5150) Wilkens, F. W. Supplying fuel to combustion engines employing dust, liquid, or gaseous fuels. (5200) Willard, K. H. and T. W. Internal combustion engines. (5010) Wilson, A. K. Manufacture of steel. ■ (5262) Wyeth, W. E. Rotating cylinder internal combustion engines and compressors. (5264) Yeadon, J. A. Stone breaker. (5126) Complete Specifications Accepted. (To be published on May 3.) [Note.—The number following the application is that which the specification will finally bear.] 1916. 3503. Blackmore, R., and Baumann, K. Feed water heat- ing. •(105248) 4708. Haddan, R. (Osborn Foreign Patents Company). Valve mechanism for internal combustion engines. (105250) 4824. White, C., and Killar, C. F. Treatment of com- bustible liquids. (105256) 4831. Lake, W. B., Moscrip, W., and Sharpe, D. Foundry ladles. (105258) 5457. Forsen, B. Internal combustion engines. (105268) 6114. Maschinenfabrik Oerlikon. High power and speed turbine plant. (100369) 6704. Peters and Company, G. D., and Hibberd, F. C. Manufacture of steam superheater elements for boilers. (105275) 8006. Weber, W. Tool for enlarging boreholes. (105281) 10735. Martineau, G. A. and G. M. Clinometers. (105300) 10836. Alfelder Maschinen- und Modell-Fabrik Kunkel, * Wagner and Company. Foundry moulding machines. (101788) 11109. Bendl, E. G. Friction clutches.' (105301) 15603. Christofferson, S. Engine jacket; and cylinder con- struction. (105308) 1917. 903. Yoxall, H. S., Wadhams, G., .and Best, A. T. Driving chains. (105320) Complete Specifications Open to Public; Inspection Before Acceptance. [Note.—The number following the application is that which the specification will finally bear.] 1917. 3657. British Westinghouse Electric and Manufacturing Company. Systems of control. (105329) 3658. British Westinghouse Electric and Manufacturing Company. Transformation of single phase alternating electric currents into polyphase cur- rents. (105330) 4344. Erste Brunner Maschinen-Fabriks-Ges., and Vors- in ann, K. Process and apparatus for the manu- facture of headers for steam generators of the Babcock and Wilcox type, etc. (105334) 4545 and 4546. Crosby Steam Gage and Valve Company. Safety valves. (105335, 105336) 4768. Tiberti, G. O. Rotary gas engines. (105339) 4848. Culver, E. L. Fuel and method of manufacturing same. (105340) 4854. Siemens-Schuckertwerke Ges. Winding, hoisting, or like machinery. (105341) PUBLICATIONS RECEIVED. “Industrial Management” (Vol. 53, No. 1), April 1917, edited by John R. Dunlap; “The Iowa Engineer” (Vol. 17, No. 5), February 1917 ; “ The Mining Congress Journal ” (Vol. 3, No. 4), April 1917; “ The Mining Magazine” (Vol. 16, No. 4), April 1917; “Journal of the Franklin Institute” (Vol. 183, No. 4), April 1917; “Transactions of the Mining Institute of Scotland” (Vol. 39, Part 3), 1916-17 ; “ Proceedings of the Engi- neers’ Society of Western Pennsylvania ” (Vol. 32, No. 10), January. Mr. Howard Williams, mineral traffic manager of the London and North-Western Railway, has been appointed by the Minister of Munitions as-Deputy Director-General. Mr. Williams joined the staff of the Ministry in September 1915, for the purpose of organising a department to deal with railway transport matters, and in October 1916 was appointed Director of Munitions Railway Transport.