1152 THE COLLIERY GUARDIAN. December 3, 1915. switch shown in fig. 2; and fig. 4 is a view of the switch with the front cover removed. The winding motor here shown as a three-phase motor of the slip-ring type, is indicated at 5, and 6 is a liquid controller for regulating its speed. The three-phase supply mains are indicated at 7, and pass through an oil switch 8 provided with overload coils indicated at 9, and tripping mechanism. A no-volt coil 10, for tripping the oil switch 8, is connected across two of the three-phase leads 7, and includes in its circuit the limit switch 11. The depth indicated in shown at 12. The band 19, pulley 18, and weight 20 constitute a friction clutch in the connection between the traveller 14 and the limit switch 11. In the event of overwinding in either direction the traveller 14 will engage with and move one F^.3 —GT 3 ft or other of the interconnected pivoted levers 15, 16, which movement will be communicated by the band 19, pulley 18, and weight 20 to the arm 17, and open the limit switch 11, thereby causing the no-volt coil 10 to trip the oil switch 8, in a manner well understood, and cut off the supply of current to the winding motor 5. The resetting of the device is accomplished by raising the weight 20, whereupon the weighted or spring controlled arm 17 will fall and com- plete the circuit of the no-volt coil by closing the switch 11. In the figures the limit switch constitued by the movable contact 28 and fixed contact 33 is shown in its closed position. If the lever 16 is moved by the traveller 14 in the direction of the arrow as a result of overwinding, the pulley 18 and resetting handle 17 will be rotated in a counter clockwise direction by the band 19. The first movement of the pulley 18 will bring the pins 36 into the other ends of the slots 35 from those shown in fig. 2, and further move- ment of the pulley 18 will then cause the stop bar 34 to be rotated also in a counter clockwise direction, rotating the shait 21 and with it the lever 27, and opening connection between the contacts 28 and 33. The circuit of the no-volt coil being thus broken, the oil switch 8 will be tripped, and the winding motor brought to rest. This form of the device is reset by depressing the handle 17, during which movement the band 19 will slip on the pulley 18. If, as should be the case, after the safety device has been in action and has been reset, the motor is started in the reverse direction, the movement of the traveller 14 will enable the lever 16 to assume its normal position. During the move- ment of the lever 16 to that position, the band 19 will be drawn over the pulley 18 by the weight 20, the parts being left in the operative position shown in the drawings. In those cases in which a depth indicator is not provided or is of such a form that it cannot be used for opening the motor controlling switch, the weighted emergency lever which applies the brakes is utilised for this purpose. (Three claims.) 20687 (1914). Improvements in Means for Rendering Air- Damp- and Watertight the Junction of Electric Wires or Gables with Boxes or Casings containing Electric Apparatus, or the like. A. Holmes, of 33, Wolsey-street, and T. H. Brierley, of 45/47, Church-street, both of Rad- cliffe, Lancashire.—Consists in grouping the glands around a hole or holes in the flange, the necessary pressure being obtained by means of a screw stud or set screw passing through the said hole or each hole. By this means the space required for a number of cables to enter the box or casing is reduced, and a more uniform pressure is obtained on the glands. Fig. 1 is a sectional side view; and fig. 2 an end view. (Two claims.) We are informed that Messrs. Yeadon, Son and Company, Leeds, have received an order from a leading colliery firm in the Barnsley district for one of their complete briquette plants to produce ovoid briquettes at the rate of 50 tons per day from small coke and coal, to be specially suitable for boiler or household consumption. Messrs. Yeadon have orders now in hand for nine of their briquette plants for firms in this country and abroad. The Norwegian wood industries recently suggested an export prohibition for props on the ground that it was neces- sary to secure sufficient raw material for those industries. The Government asked the opinion of the Norwegian forest owners on the matter, and the latter have emphatically advised against such a measure, partly because it would injure economic interests without greatly improving the position of the industry, and partly because it would endanger the commercial relations with Great Britain. The Government consequently is said to have decided against the proposal. NEW PATENTS CONNECTED WITH THE COAL AND IRON TRADES. Applications for Patents. 16419. Fire extinguisher. F. E. Freeman. 16422. Strainers for pump suction pipes. J. Thomson. 16432. Condensing steam-turbine plants. K. Baumann. 16443. Methods of and apparatus for producing and dis- tributing electric current waves. British Thomson-Houston Company Limited. (General Electric Company, U.S.A.) 16451. Smokeless fuel and process of producing same. A. V. Derry. 16458. Steam wagons. P. W. Robson and Clayton and Shuttle worth Limited. 16459. Steam wagons. Clayton and Shuttleworth Limited, P. W. Robson, and F. J. Bretherton. 16470. Steam super-heaters for locomotives. D. E. Stirling. 16476. Alternating-current motors. A. H. Neuland. 16477. Audible and visual indicators for use in mines and the like. J. P. Forster. 16504. Rotary engines, or air pumps. C. L. Burdick. 16505. Explosives. Powerite Explosive Company Limited. 16526. Manipulating mechanism for coal gas generating apparatus. A. E. White. (Riter-Conley Manu- facturing Company, U.S.A.) 16534. Centrifugal pumping apparatus. British Thomson - Houston Company Limited. (General Electric. Company, U.S.A.) 16559. Clasps or couplings. E. J. Swedlund and Eisenstadt Manufacturing Company. 16562. Production of tungsten from scheelite. J. C. Butter- field and A. Ashworth.. , 16602. Electric furnaces. F. Cochlovius. 16603. Percussive coal-cutting machines and the like. C. Henderson. 16604. Coal-cuttiing machines of the percussive type. C. Henderson. 16606. Treatment of mineral oils and residues for the pro- duction of useful products, and apparatus for this purpose. J. F. Wells. 16617. Furnace dust collectors. U. Wedge. 16621. Steam super-heaters for locomotive and like multi- tubular boilers. W. H. LewTers. 16634. Chequer bricks as used in the chequering of car- bureted water-gas plants or coke oven chambers. E. D. Davison and C. Tooley. 16658. Treatment of peat for manurial and other purpores. W. B. Bottomley. 16660. Rotary pump. F. P. Bosch. 16673. Gas producing plant and the recovery of a by-proTic*^ from the gas produced. C. B. Tully. 16674. Plants or apparatus suitable for prospecting and locating minerals, ores, and metals. W. E. Cox. 16687. Mine signalling apparatus. W. L. Dyer. 16689. Combination boiler and cylinder. S. Naylor. 16692. Winding drums for electric wires, cables, and thr* like. H. F. Smithson and Callender’s Cable and Construction Company Limited. 16711. Art of firing gas furnaces. J. and G. Keith. 16748. Means for utilising methane or marsh gas given off from mine workings and like places. E. Moxon. Complete Specifications Accepted. (To be published on December 16.) 1914. \ 18838. Treatment of peat for use as a fertiliser. T. Rigby, and Wetcarbonizing Limited. 22707. Sliding doors for railway wagons, cars, and other vehicles. Janse. 22769. Rotary compressor or exhauster. Johnston, and Globe Pneumatic Engineering Company. 22871. Regulating devices for mixed pressure turbo-com- pressors. Warwick Machinery Company (1908). (General Electric Company.) 22927. Apparatus for operating electric devices at a distance. Siemens and Halske Akt.-Ges. 23037. Pneumatic conveyors. Bristow. 23048. Water tube boilers. Vinke. 23353. Safety shackle for underground trams. Hale. 23377. Steam super-heaters, and feed water heaters for locomotives. Spencer. 24789. Rotary pumps. Rixen. 1915. 3149. Self-oiling wheels for colliery corves and other vehicles. Samuel Osborn and Company, and Bradley. 3815. Rotary screens for screening broken stone or other material. Plant. 5629. Electric signalling apparatus or indicators. Bobroff, and Universal Indicator Company. 10818. Liquid fuel pulverising and vaporising devices for internal combustion engines. Schmid. Complete Specifications Open to Public Inspection Before Acceptance. 1915. 15753. Apparatus for ascertaining the direction of boreholes. Carlson and Bergstrom. THE ACQUISITION OF ENEMY PATENT RIGHTS. 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, which right, when acquired, can be retained after the war, 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 Patents Register. If any patent listed has been assigned to a non-enemy pro- prietor, the law does not apply. 10697/05. Steam engines, etc. Condensers, preventing overflow from. Apparatus to prevent water from the condenser of a condensing engine or turbine from entering the cylinder or wheel in the event of the condenser being flooded. Korting, Akt.- Ges., Germany. 10949/05. Dynamo-electric machines ; commutators. In order to prevent sparking at the commutators of elec- trical machines, owing to the uneven wear of the insulation and metal laminae, the mica insula- tion used is previously calcined under pressure. The mica is pressed between two plates of suit- able material, and placed in a calcining furnace. M. Meirowsky, Germany. 12175/05. Relates to means for counterweighting floating cranes. A stationary support is mounted on a pontoon. The turning support surrounds the stationary support like a bell, and rotates upon a bearing and pressure rolls on the deck of the pontoon. The counterweight is arranged to project from the lowTer end of the bell mantle opposite the jib, and is preferably constituted by a receptacle containing the driving mechanism and gearing, or a portion of the same. The counterweight may be adjustable in position. A. Bode and K. Bottcher, Germany. 12165/05. Lifts. In order to facilitate the transfer of trucks • from a mine cage to the fixed tracks, an adjust- able platform is employed. The platform is pivoted and balanced by a counterweight, so as to be readily actuated by a handle. The platform has rails adjacent to the butt ends of the rails of the fixed track, the outer ends terminating in pawls, which normally rest on the stage of the arrested cage, so as to enable trucks to run smoothly on to the rails. Should the cage in ascending strike these pawls on the underside, the platform swings on the pivot shaft; but should the cage strike, in descending, the upper • side of the pawls, these latter simple move on their pivots. The cage is thus enabled to pass the platform without injury. C. Eickelberg, Germany. 7021/05. Tipping apparatus. In an apparatus for tipping railwav wagons, the wagons are drawn on to an ascending track over points or tongues resting upon the rails of the permanent way. The curved track forms a portion of a frame running on the track rails, and containing suitable hoist- ing gear. The lower portion of the track is pro- vided with tongues resting on the rails. An additional track is arranged below the track for a travelling truck, upon which the front wheels of the wagon run. H. Aumund, Germany. Copies of any of the above specifications can be supplied at the price of 15. post free. GOVERNMENT PUBLICATIONS. Any of the following publications may be obtained on application at this office at the price named post free. Boilei Explosion Reports : (No. 2391), at Mansfield Colliery, 4|d.; (No. 2383), Blow-Off Pipe of a Lancashire Boiler, 4|d. National Insurance : Unemployment Insurance Decisions given by the Umpire re Claims to Benefit (Vol. 2), 2s. 6d.; First Report of Medical Research Committee upon the Incidence of Phthisis in relation to Occupation : The Boot and Shoe Industry, 4d. Statutory Rules and Orders, 1915 •: (No. 1004) Customs Order, l|d. Consular Reports : Mexico, Vera Cruz, 1914, ljd. ; Persia Trade for 1913-14, 2d.; Brazil, Para, 1914, 2Jd.; Portugal, Lisbon, 1914, 3|d.; China, Wuehow, 1914, 2d.; Portugal, Chin de, 1914, 2d. ; France, Calais, 1914, IJd. Foreign Trade Accounts up to November 17, 1915, 4d. Railway Accidents, Summary for the Three Months ending June 1915, 9£d. Increase of Rent and Mortgage Interest War Restriction Bill, ljd. Patents and Designs Act Partial Suspension, Id. PUBLICATIONS RECEIVED. Coal Mining in Illinois (Bull. No. 13. Vol. 2, No. 1 of the Illinois Coal Mining Investigations Co-operative Agree- ment). By S. O. Andros. Urbana, Illinois : University of Illinois. “ Inventions Subject Matter Index, 1900-1911; Chronological List, 1905-1911, of the Patent Office of India,” price 3 rupees; “Journal of the Institute of Arbitrators” (Vol. 1, No. 1), November; “Records of the Geological Survey of India ” (Vol. 45, Part 3). Coal Trade Benevolent Association. — It is earnestly requested that all who have not yet returned their collecting sheets or cards re “ Benevolent Day,” October 16, 1915, will kindly do so at once, to facilitate completion of the returns for the annual report of the association, now in course of preparation. Osram Lamps.—The large response of the electrical industry to the call for recruits has resulted in difficulties for the lamp manufacturer, as well as for other departments of electrical enterprise; but we are informed that at the Osram-Robertson Lamp Works (Hammersmith, London, W.) the management have been able to effect a steady improvement in the Osram drawn-wire lamp, which are even more efficient than formerly, and retain their initial candle-power for a lengthened period, without shortening the life of the lamp. The reports of the National Physical Laboratory comment upon the fact that the wattage and candle-power of Osram drawn-wire lamps correspond with exceptional accuracy to the standards in each case. Mine Safety Committees in Canada.—Recently, before the Canadian Mining Institution, Mr. T. F. Sutherland, Chief Inspector of Mines for Ontario, gave an account of safety committees at coal mines. Within the past three years several Ontario mining companies have instituted safety departments, in an endeavour to reduce accidents. In some cases the department is in charge of a safety engineer,, in others a mine inspector is appointed, who works in conjunction with the mine manager; others again have appointed safety committees. Between working shifts the inspector makes a complete tour of the mine, and inspects each working. The men, as they leave the mine, report any holes blasted and anv missed or cut-off holes. Mr. Sutherland stated that effi- ciency has increased, the dominant feature of the system being that carelessness is not permitted. Where the safety committees are formed there is a regular oversight of the mine. Every fortnight the committees meet and discuss with the manager the practices and conditions which appear to them to be unsafe. The system is stated to have proved a saving of time and money to both employer and workman.