538 THE COLLIERY GUARDIAN. March 6, 1914. the raising or lowering of the boring or similar tool is effected by means of the motion in a suitable orbit of a loosely- mounted pulley round which the cable supporting the boring tool passes, the first part of the rotation of this pulley being caused by the driving shaft and the second part by the weight of the suspended tool. The invention consists in mounting on the driving shaft a fixed arm, and a loose arm, the latter carrying the loose-grooved pulley round which the cable supporting the boring or similar tool passes, the fixed arm bearing against a tappet in the loose arm, so as to drive the latter during the first part of the rotation of the said loose arm, the second part of the ro ation being due to the weight of the suspended tool. Fig. 1 is a diagrammatic view of the general arrangement of an example of one form of the improved apparatus as applied to borings; fig. 2 is a front elevation of the apparatus proper drawn to a larger scale ; fig. 3 is a view of a detail. (Two claims.) 12380 (1913). Improvements in or in connection, with the Cutter Holders of Coal Cutting Machines. F. Eckersley, of Abbotsford, Kenilworth-avenue, Harrogate, Yorkshire.— The invention is described as applied to a chain cutting machine, but is also applicable, with evident modification, to machines of the cutter wheel type. The holder comprises a link block, forming a link or link member of the chain, and a cutter box in which the cutters are fixed and held. The link block is provided on the outer side or edge at each end with a projection or lug, having a narrow longitudinal slot to receive the eye end of an eye bolt or screw, or preferably of a tee-headed bolt. Only one eye bolt is used, the eye end of which is fitted in the slot of the lug at the forward end of the block, so considered with reference to the direction in which the chain is moving; the cutter box being reversible for cutting in both directions. The outer edge of the block between the lugs is slightly rounded, so as to have the ends of the cutters which rest against it tangential. The cutter box, which is considerably wider than the link block, is slotted or has flanges at both ends, forming forks, which receive and overlap the lugs of the link block. A pin is passed at each end through holes in both the flanges and the lugs. The pin at the forward end passes also through the eye bolt, where such is used instead of a tee-headed bolt. The pin holes in the lugs of the link blocks are elongated in the direction parallel to the chain to allow for play hereinafter referred to. The screwed portion of the eye or tee-headed bolt screws into the forward end of the cutter box at the bottom of the fork formed by the end flanges of the cutter box; and a spring washer, or equivalent spring, is placed over the bolt in the bottom end of said fork; the forward end of the washer or spring pushing against the inner side of the forward lug of the link block, and the rear side or end of the washer pushing against the cutter box. The cutter box is provided with the usual socket holes for the cutters, and the rear end of the box between the side flanges slopes forward ; so that the lower rear edges or corners of the cutters project past such sloping part and bear directly against the inner edge of the rear lug of the link block, due to the pressure of the before- mentioned spring against the cutter box, the elongation of the before-mentioned pin holes allowing the necessary play. The rear end of the block may be radial instead of sloping, provided only that the lower rear edges of the cutters project as described. By means of short keys or studs fixed to the pins, and grooves or keyways in the pin holes of the cutter box, the pins can be rotated to a position which prevents them inadvertently coming out. The pin at the forward end of the cutter box is fitted with, a projection, key or stud, and the slots in the box and link block are so made that when the box is in a position at right angles, or any angle may be chosen, with the chain, the above slots come opposite to each other, forming a continuous groove along the side of the pin hole, down which the key on the pin slides when put in position. When the pin is home, it will be evident that, on turning the box into the working position, the pin turns with it, so that the slots are not in line and the pin cannot come out without swinging the box back in the before-mentioned position. The key on the pin may be in the position to engage with the eye bolt, when an eye bolt is used, or the bottom flange of the cutter box as desired. Fig. 1 is a side elevation of the link block, and fig. 2 is a plan of the same; fig. 3 is a longitudinal section on line A A of fig. 4, and fig. 4 is an outside plan of the holder complete; fig. 5 is a view of the forward end of the holder complete, and fig. 6 is a section of the cutter box only, on line B B of fig. 4. (Four claims.) HEW PATENTS CONNECTED WITH THE COAL AHO IRON TRADES. Applications for Patents. 4639. Method of treatment for minerals in a finely divided state preparatory to smelting. J. A. Heskett. 4643. Tube rolling mills. Mannesmannxdhren-Werke. 4654. Ore-grinding machines. H. S. Denny. (G. A. Denny, Mexico.) 4669. Valve mechanism for compound steam engines. Heinrich Lanz (Firm of). 4673. Gas producers. P. A. J. Cousin. 4686. Drainage hoppers, bunkers or the like. C. Burnett. 4687. Process of and apparatus for coal-washing. C. Burnett. 4688. Process of or apparatus for washing coal. C. Burnett. 4695. Driers for sifted or separated materials and the like. T. M. Allison. 4696. Graders for coal, coke and the like. T. M. Allison. 4709. Weighing apparatus or the like. W. and T. Avery Limited, and W. G. Goulding. 4718. Label clips for railway wagons and the like. G. Eggar. 4736. Production of sulphite of ammonia. W. Macnab and T. L. Gregson Bell. 4742. Electric furnaces. J. L. Dixon. 4744. Treatment of sheet metal. W. Player and W. Brace. 4745. Devices for winding sheet metal and for analogous purposes. W. Player and W. Brace. 4751. Dynamo-electrical machines. Hon. Sir C. A. Parsons and A. H. Law. 4754. Attachments to railway wagons or other vehicles, by which the brakes can be applied or released at either side of the vehicle, irrespective of that on which they have been applied. C. MacAlister. 4757. Fuel briquettes. T. H. Peters, sen., T. H. Peters, jun., G. L. Tuxford, and C. P. Tuxford. 4792. Grinding or breaking mills. J. Y. Johnson. (Geb. Pfeiffer, Germany.) 4799. Extractor for removing tarry particles held in suspension in gases. W. J. Fiddes. 4805. Process for making soil or rocks impervious. A. Abraham. 4812. Apparatus for working or bending sheet metal. H. L. Lewen. 4816. Dust-distributing truck for collieries. E. Allday, J. N. Collins, and F. Lyon. 4832. Clothing for miners and other workmen. S. Kirshen and H. Kirshen. 4833. Method and means for discharging different kinds of minerals or other substances from washing appliances. J. W. Blackhurst and I. C. Black- hurst. 4837. Lubrication of the axles of mining hutches, corves, wagons, and the like. R. B. Somerville. 4843. Safety catch for pit cages, hoists, lifts, and the like. I. Harris. 4853. Means or apparatus for spraying or distributing stonedust in collieries. H. Houghton. 4937. Smelting ores and apparatus therefor. F. W. Highfield. 4938 Concentration of ores. H. L. Sulman and Minerals Separation Limited. 4971. Presses for pressing scrap metal into blocks and for other analogous purposes. John Summers and Sons Limited and H. H. Summers. 4987. Chain-grate stokers. H. E. Metcalf. 4999. Means or apparatus for screening or grading coal prior to the washing of same. C. Burnett. 5042. Operation of turbo-compressors or pumps. Akt.-Ges. Brown, Boveri et Cie. 5051. Purification of gases. E. Howl and F. Perry. 5060. Crushing and breaking machines. O. Wauthier. 5098. Haulage clips for colliery hutches, wagons, or like vehicles. D. M. Ritchie. 5102. Shackles for coupling colliery trams or the like. A. J. H. Boyton. 5170. Centrifugal pumps. W. Hepburn. 5182. Hydraulic briquetting-machinery. G. H. Denison and C. Korte. 5183. Ventilating fans. F. S. Carter. 5190. Air-compressors. P. R. and G. H. T. Rayner. 5218. Process for the preparation of pure peat or turf and the article produced. W. von Ruckteschell. 5248. Processes and apparatus for the conversion of heavy hydrocarbon oils into lighter oils. F. Lamplough. Complete Specifications Accepted. To be published on March 19, 1914. 1912. 29485. Making of expanded metal. Chess. 1913. 4378. Respiratory apparatus. Drager. 4687. Apparatus for manufacturing ammonium salts from ammoniacal substances. La Suburbaine (Vidanges et Engrais), Soc. Anon. 4909. Manufacture of artificial fuel. Blumberg. 4992. Apparatus for testing coal or ores. Habets and France. 5449. Ropeways. Donald. 5467. Detectors of combustible gases. Philip and Steele. 5994. Foundry moulding-machines for pipes. Ardelt. 6244. Pneumatic percussive tools. Arthur. 6692. Turbo-compressors and turbines. Churchill-Shann. 7623. Turbine plant. Croft. 7697. Elastic fluid turbines. Warwick Machinery Com- pany (1908). (General Electric Co.) 8110. Condensers for distilling apparatus and the like. Ockel. 9048. Concentrating and separating machines for ores or the like. Richardson. 10821. Ingot molds. Bradford. 11843. Metal furnace. Hall. 12437. Means for electrically indicating or counting revolu- tions of shafts, axles, or the like. Siemens Brothers and Co. and Hird. 12686. Rock or coal drilling apparatus. Brown. 12810. Machines for crushing stones, ore, and the like. Rennerfelt. 13610. Cooling of apparatus built in connection with an electric motor. Akt.-Ges. Brown, Boveri et Cie. 14426. Magnetic separators. Fried. Krupp. Akt.-Ges. Grusonwerk. 16440. Reversing valves for furnaces. Olig. 16910. Process of burning solid fuel. Glasgow. 16911. Process of burning solid fuel. Glasgow. 17111. Classifier for crushed ores. Deister. 20831. Dry ore separators. Bonson. 21891. Marine cableways. Miller. 24233. Centrifugal blowers and other centrifugal machines of similar nature. Homersham. 25367. Conveyors for use in coalmines and other places. Bowman and Jackson. 26218. Metallurgical and other furnaces. Williams. 1914. 179. Valves for pumps and the like. Winterhoff. Complete Specifications open to Public Inspection before Acceptance. 1913. 20879. Process for increasing the yield of chromium in the alumino-thermic production of carbon-free ferro- chromium from chrome iron ore. T. L. Gold- schmidt Akt.-Ges. 22585. Regenerative furnaces. Rehmann and another. 1914. 3835. Electric furnaces. Soc. Electro Metallurgique de St. Beron. 3986. Electro-magnetic shaking-feeds or jiggers. Maschi- nenbau Anstalt Humboldt. 4192. Hauling plant for miners’ trucks. E. Nack’s Nachf older. 4355. Composite heat-storage apparatus. Allgemeine Electricitats Ges. GOVERNMENT PUBLICATIONS. *** Any of the following publications may be obtained on application to thia office at the price named post free. Grimsby Light Railways Regulations, l|d. Science Examination Papers, 1913, Is. Id. Eleventh Report of Proceedings under the Conciliation Act, 1896, for 1913, ll|d. Railways, &c., Bills : Report, 1914, 8|d. Factory Forms, No. 2, 4d. ; No. 955 re Tinning of Metals, l|d. ; No. 47, l|d. Pauperism Statement for January 1914, l|d. Bills, 1914: Education, l|d. ; Companies, Copartnership, lid. Mining Ordinance of Northern Nigeria, No. 10, 1913, 7d. PUBLICATIONS RECEIVED. The Investors’ and Patentees’ Year Book for 1914. By W. H. Taylor. London and Manchester : The Dexter Press Limited. Price 7s. 6d. net. “ Transactions of the Institution of Mining Engineers” Vol. 46, Part 3), price 3s. ; “ The Journal of the Man- chester Geographical Sooiety ” (Vol. 29, Parts 1 and 2), 1913 ; “ Annales des Mines de Belgique” (tome 19, No. 1) ; “ Zeitschrift fur das Berg. Hutten- u. Salinenwesen ” (Band 62, 1 Heft) ; “ The Iowa Engineer ” (Vol. 14, No. 4), January ; “The Naturalist” (No. 686), March; “ Le Mois Scientifique et Industriel ” (No. 173), January, price 2s.; “The Journal of the Royal Statistical Society ” (Vol. 77, Part 3), February, price 2s. 6d. Mining Telephones.—We have received copies of an interesting correspondence that has recently passed between the Telephone Manufacturers’ Association and the Home Office in regard to the voltage, of magneto generators in mining telephones, with special reference to No. 15 (a) of the Electricity Special Rules under the Metalliferous Mines Act, and No. 134 (a) of the General Regulations under the Coal Mines Act. On October 20, 1913, Mr. E. A. Browne, F.C.A., the secretary, wrote drawing attention to paragraph 15 of the Metalliferous Mines Regulations, which provides that “ where electricity is used for signalling the pressure in any one circuit shall not exceed 25 volts,” and stating that the members had received several recent enquiries from collieries for watertight telephones with a requirement that the voltage of the magneto generators should not exceed 25 volts. It was commercially impossible, however, to provide telephones with a generator which would ring bells satisfactorily with a voltage of 25 volts. An answer was received on November 27, 1913, stating that the requirement of No. 15 (a) of the Electricity Special Rules under the Metalliferous Mines Act, and the corresponding regulation under the Coal Mines Act No. 134 (a) of the General Regulations related only to signalling and not to telephonic communication.