522 THE COLLIERY GUARDIAN. September 15, 1916. to wave-shaped or corrugated strips by hammering, are inserted into the filter frame in staggered layers, and com- pressed in a hot state. To manufacture the filters, the long spiral shavings are simultaneously stretched and hammered in such a manner that wave- or cork-screw strips 4 are pro- duced, as shown in fig. 4. From these strips is made a screen with very fine meshes, by first placing on the screen surface 2 a layer of approximately parallel strips. Above the said layer, staggered at a certain angle, is placed another layer of parallel strips 4, so that the strips of the two layers intersect each other, as shown in figs. 3 and 4. As many of these layers are superposed and staggered as required to ensure a given density of the filter. This ensures uniform width of mesh at every point of the filter. In order, however, to obtain the necessary density for keep- ing back the furnace dust, an incandescent iron plate 5 is placed on the second layer after it has been put on, where- upon the two layers of the strips 4 are compressed by the stamp 6 of a press in the manner shown in fig. 2. The heat of the iron plate 5 is communicated to the steel strips, which lose a part of their springiness. Consequently, the intervals between the single strips 4, which have been greatly reduced by the compression of the two layers of strips, retain their size. After each new layer is put on, it is compressed with the incandescent plate 5, and this is continued until the required density is attained. The filter js then closed by the upper screening surface 3'. To enable the metallic filter to be replaced without interrupting the working for a long time, several, for instance, two, filters 13 could be inserted into the openings 14 of a bracket 15 having the shape of spectacles and pivoted to a central pin 16 on the gas pipe 17, 18 (fig. 5). This pipe is provided, at the point of introduction of the bracket 15, with guide frames 19, 20 with which the frame 1 of the filters 13 form a tight joint. If, after a certain time of working, the filter is choked, a fresh filter 13 inserted in the meantime into the free opening 14, is brought between the guides 19, 20 by turning the bracket 15, whilst the used filter is removed and cleaned or replaced by another. The dust held back by the filters is discharged through the pipe branch 21 into a dust collector. To reduce the dimensions of the filters for the purpose of facilitating their manipula- tion, the pipe can be divided in front of the filter; into each branch pipe is then inserted a separate small filter, and the branch pipes are again connected together behind the filter (fig. 6). (Seven claims.) 100977. Internal Combustion Engines, Valve Gear, and Mechanism. T. N. Barker, of Woodlands, Esholt, York- shire.—Relates to internal combustion engines of the four- cycle sliding sleeve type, wherein are employed two half sleeves and one whole sleeve, and its object is to secure the opening -and closing of both the inlet and exhaust ports exceptionally quickly, together with -a maximum opening of comparatively long duration. The drawing is a vertical section of the engine, with the exception of the stationary piston head S. The said piston head is intended to be water cooled and provided with screwed hole to receive sparking plug. The figure also shows the disposition of the various parts at explosion point. Within the cylinder A are two half sleeves B and C, and one whole sleeve D. The piston E reciprocates within the whole sleeve, which also receives, at the uppermost end, the stationary piston head, provided with spring rings to prevent leakage on the compres- sion and power strokes. The cylinder A is provided with an exhaust port F and on the opposite- side and inlet port G and the said half sleeves and whole sleeve are given such move- ment in a vertical direction that the ports H and J open upon each other opposite the port F in the case of the ex- haust, -and the ports I and K open upon each other opposite the port G in the case of the inlet, fit the correct time and in accordance with the correct cycle of opera- tions. The ports F and G in the cylinder are in the form of a rectangle or slot, and are extended round the cylin- der wall in a hori- zontal plane for such distance as will secure an adequate passage for the exhaust and inlet gases. The ports H, I, J, K tare similar given such width A suitable and convenient arrangement for operating the sleeve D and the half sleeves B and C is indicated in the figure where the sleeve operating shafts are provided with gear wheels, indicated by the dotted circles T U, which are directly connected with a similar gear wheel V on the crank shaft of half the size of T U by an endless chain also indicated by a dotted line. The sleeve operating shafts are thus rotated at half engine speed. The crank pins R and P operating the half sleeve B and the sleeve D respectively are in one with the shaft, and are connected to their respec- tive half sleeve and whole sleeve by the connecting rods or links W and X. A similar crank pin and link operates the half sleeve C. (Three claims.) in shape and formation, and are as the cycle of operations demands. Partnerships Dissolved.—The London Gazette announces dissolution of the following partnerships :—J. Rigg and G. L. Tweedale, trading as J. Rigg and Company, engineers, Loin ax-street, Rochdale; A. C. Heap and W. P. Digby, trading as Heap and Digby, consulting engineers, 48, West- minster Palace-gardens, London. Grimsby Coal Exports.—Returns for the week ended September 8 show that the following quantities of coal have been exported from Grimsby :—Foreign : To Dieppe, 185 tons; Gothenburg, 1,053; Esbjcrg, 981—a total of 1,319 tons foreign, compared with 12,250 tons foreign and 2,675 tons coastwise during the corresponding period of last year. 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.] Bates, C. (12784). Pumping apparatus. Benton, W. A., and Benton’s Patents Limited (12660). Indicating weighing mechanisms. Roving, J. O. (12687). Electric furnaces. Brackett and Company, F. W. (12554). Valveless rotary pumps. British Thomson-Houston Company (12783). Centrifugal compressors. British Thomson-Houston Company (General Electric Com- pany (12624). Systems of electric motor control. Broderick, E. F. (Broderick, J.), and Charles, P. F. (12632). Puddling furnaces, and processes for making wrought iron. Chick, W. E. (12751). Self-reversing shunting levers. Clark, W. A. (12481). Apparatus for heating or vaporising paraffin, etc., for internal combustion engines. Collingham, R. H. (12783). Centrifugal compressors. Ccpsey, E. L. (12554). Valveless rotary pumps. Corkhill, P. F. (12774). Fire lighter. Court Works (12564). Chain grates. Cunis, W. E. (12784). Pumping apparatus. Davies, W. R. (12596, 12666). Machinery for manufacture of tin-plates and sheets, etc. Drayton, T. J. B. (12721). Internal combustion engines. Falk, Stadelmann and Company (12553). Fire lighters. Fill, S. J. V. (12615). Internal combustion engines. Fouarge, F. (12491). Furnaces. Fregoso, S. C. (12477). Internal combustion engines. Gilgrass, T. (12469). Picks for mining, etc. (Hansell Grate Company) (12620). Grate bars. Hodgson, J. L. (12593). Fluid meters. Holehouse, W. H. (12655). Boiler, etc., furnaces. Holt, S. (12526). Internal combustion engines. Howden and Company, J., and Hume, J. H. (12785). Draught installations for boilers. Hunstone, T. H. (12572). Coal saving device for fire grates. Hutchinson, J. J., and Jacob, G. N. (12492). Production of fuel for internal combustion engines, etc. Jackson, W. U. (12595). Gas producers or generators. Kirby, E. A. (12632). Puddling furnaces, and processes for making wrought iron. Lane, F. (12771). Roller conveyors. Ling, E. M. (12523). Rotary motor applicable as pump or compressor. Longford, H. G. and W. W. (12481). Apparatus for heating of vaporising paraffin, etc., for internal combustion engines. Lovell, A. W. (12745). Bracing gasometer framing, etc. McClelland, A. R. (12553). Fire lighters. Macfarlane, M. and O. P. (12643). Pressure gauge. North, T. K. (12706). Internal combustion- engines. O’Brien, J. M. (12579). Production of liquid fuel for internal combustion engines. Parker, C. H. (12564). Chain grates. Roberts, W. E. (12526). Internal combustion engines. Robinson, L. H. and M. H. (12684). Releasing hooks and mechanism connected therewith. Robson, J. (12705). Oil, etc., engines. Russell, W. (12714). Metallic packings for piston rods, etc. Salway, A. E. (12539). Multi-cylinder internal combustion engines. Seddon, W. H. (12601). Rotary elastic fluid engines, pumps, compressors, etc. Shepherd, J. (12528). Electrical generators and electric motors. Smith, W. S. (12595). Gas producers or generators. Sphinx Manufacturing Company (12481). Apparatus for heating or vaporising paraffin, etc., for internal combus- tion engines. Stanworth, L. (12619). Water power systems. Stotbert and Pitt, and Toplis, C. M. (12568). Cranes. Symons, E. B. (12623). Crushing machines. Tangyes Limited (12705). Oil, etc., engines. Thomas, H. S. and R. B. (12596, 12666). Machinery for manufacture of tin-plates and sheets. Umpleby, F. (12755). Internal combustion engines. Vickers Limited (12706). Internal combustion engines. Watkinson, W. H. (12669). Internal combustion engines. Weldless Steel Tube Company (12595). Gas producers or ■ generators. Widmer, F. (12702). Device for conveying, etc. Williams, S. E. (12771). Roller conveyors. Wilson, C. F. (12734). Boring tools. Wood, W. H. (12602). Asphalt cauldrons, tar boilers, etc. Young, J. W. (12497). Alarm for automatically announcing decrease or failure of gas pressure. Complete Specifications Accepted. (To be published on September 28.) 1914. 24629. Regulating means for electrical installations. Soc. Anon, des Etablissements L. Bleriot. 1915. 519. Polyphase generator for high frequency currents with polyphase tuned spark gap. Rouzet. 8265. Smelting furnaces. Ruck. 8334. Dynamo electric power transmission apparatus of the unipolar type. Breslauer. 8335. Steam condensing plant. Morison. 10418. Process for agglomerating ores. Fried. Krupp Akt.- Ges. Grusonwerk. 12532 and 12533. Rope supporting rollers for mine shafts, haulage tracks, and the like. MacGregor and Jones. 12597. Means for regulating and/or indicating temperatures. Hall. 12723. Valve gear for internal combustion engines. Serex. 12776. Apparatus for charging gas retorts. Bird, Robert Cort and Son Limited, and Sims. 12829. Apparatus for cleaning the smoke tubes of steam boilers. Parry. 12875. Priming devices for internal combustion engines. Kopf. 12968. Gas supply regulators or governors. Bentley. 13012. Stuffing box piston and similar packings. Arthur G. Enock and Company, and Enock. 13283. Means for regulating the output of dynamo electrical machines driven at variable speeds. Dufty. 13819. Coke oven doors. Mitchell and Morfey. 14391. Utilisation of Mond gas, and the recovery of by-pro- ducts therefrom. Twynam. 14639. Charging of two-cycle gas engines. Mather and Platt Limited, and Davidson. 17318. Gas engines. Travis, and National Gas Engine Com- pany. 17731. Means or apparatus for warming the feed water of fuel economisers and the like. Ogden. 17994. Two-stroke cycle internal combustion engines. Robert- son and Moss. 1916. [Note.—The numbers following the application are those which the application will finally bear.] 318. Weighing machines. Smith, A., and Southall, C. 101302 2783. Coal gas making apparatus. Carroll, L. D. (Chris- man, C. S.). 101306 2792. Condensers. Hough, A. 101307 3598. Tilting furnaces or the like. Kitchen, H. J., and Balmforth and Company, T. 101310 4562. Method of and apparatus for softening water. Linden, L. 101314 7683. Apparatus for the detection of leakages in the water jackets of blast furnaces. Burt, L. S. (Retuerto y Rizo, E.). * 101327 10024. Process for distilling bituminous substances. Aarts, J. G. 100952 Complete Specifications Open to Public Inspection Before Acceptance. 1916. [Note.—The numbers following the application are those which the application will finally bear.] 10170. Internal combustion engines. Algrin, R., and Breton, J. L. 101338 11244. Guiding apparatus of multi-cellular steam and gas tur- bines. Akt.-Ges. Brown, Boveri -et Cie. 101342 12160. Vapour electric converters. British Westinghouse Electric and Manufacturing Company. Restoration of Lapsed Patent. An order has been made, restoring the Letters Patent granted to Arthur Greenwood and Konrad Andersson, for “ Improvements in ejectors and compressors for air, gases, and vapours,” No. 25363/07. Application to Avoid or Suspend Patent or Licence. No. and year of patent. Name of grantee. Short title. | Name & address of applicant. 1 Date of hearing. 3117/11 Van Devoorde Removal of boiler incrus- tation. J. C. McQuitty Ltd., Indepen- dent - street, Short Strand, Belfast. Sept. 22. Any person interested who desires to be heard in opposition to the above-mentioned application must give notice in writing addressed to the Comptroller-General of the Patent Office, 25, Southampton- Luildings, London, W.C., before the date of the hearing. GOVERNMENT PUBLICATIONS. *** Any of the following publications may be obtained on application at this office at the price named post free. Trade and Navigation Returns for August, 1916, Is. 9d. Trinidad and Tobago Report, April to December 1915, 6Jd. PUBLICATIONS RECEIVED. Text-Book on Coal Mining Science. By J. Parker. London and Edinburgh : Oliver and Boyd. Price, 3s. net. The A.B.C. Guide to Patents for Inventions. By R. E. Phillips & A. M. Flack. London : Phillips’s. Price, 6d. ‘‘ Bulletin et Comptes Rendus Mensuels de la Society de 1’Industrie Minerale” (January-March 1916); ‘‘Proceed- ings of the Engineers’ Society of Western Pennsylvania ” (Vol. 32, No. 6), July; “ The Indian Journal of Medical Research ” (Vol. 4, No. 1), July; ‘‘British and German Industrial Conditions : A Comparison,” by A. Stewart (a reprint, with additions, of articles which appeared in Electricity ”), price 6d. Excess Profits Duty. By Spicer and Pegler. London : H. Foulks Lynch and Company. Price, 6s. net. Hull Coal Exports.—The official return of the exports of coal from Hull to foreign countries for the week ended September 5 is as follows:—Amsterdam, 313 tons; Alex- andria, 2,584; Gothenburg, 3,433; Guernsey, 359; Har- lingen, 806; Havre, 6,324; Iggesund, 1,374: Jersey, 758; Mo-i-panen, 1,049; Naples, 491; Palermo, 306; Rotterdam, 1,572; Rouen, 9,167: Savona, 3,676; Torre Annunziata, 3,691; West Coast Africa, 1,509—total, 37,412 tons. Corre- sponding period September 1915 — total, 87,467 tons. Corresponding period September 1914—total, 38,229 tons. These figures do not include bunker coal, shipments for the Brinish Admiralty, nor the Allies’ Governments. German Coal for Switzerland.—The annual report by the Federation of Swiss Engineering Works refers to the ques- tion of coal supplies. The German output, which had been declining since the outbreak of the war, fell very markedly during the first quarter of the year, owing to the continuous drafting of miners for the war. Attempts were made to employ war prisoners in the mines, but the results were not satisfactory, and, in consequence, the authorities began to liberate from the army both miners and members of colliery technical staffs. This relieved the position appreciably. A large proportion of the year’s exports to Switzerland were from Belgium. The coal is carried on Belgian railway wagons to the Swiss border, and there re-loaded on German wagons, no Belgian rolling stock being allowed to leave Germany. The export business is carried out solely through two central bureaus, one in Antwerp, and the other in Brussels, these being under the control of the German authorities. Swiss manufacturers producing dye stuffs, etc., for the Allies were refused coal supplies, and Holland has sent none since February 1, 1915.