THE COLLIERY GUARDIAN ________________________________________________________________________________ 644 September 24, 1915. obviate the shanking of the end of the drill or bit, which is necessary with some attachements as at present constructed. Fig., 1 is a side elevation of a known type of rock drilling machine equipped with the invention; fig. 2 is a part sec- tional elevation of the front head of the machine and the water-supplying attachment drawn to an enlarged scale; and fig. 3 is a front elevation of fig. 2. In fig. 1 of the drawings, the rock drilling machine is denoted by the numeral 1, 2 representing the front head thereof, which, as shown, is resiliently bolted to the main cylinder 3 of the machine; 4 is the bit, drill, or steel (shown of hexagonal cross section) which projects through an axial hole 2a through the head 2, and receives at its inner end 5, either directly or indirectly, the impacts of the hammer piston of the machine in a manner that is well understood. A hollow drill steel is employed, that is to say, a drill steel which is provided with an axial hole or other longitudinal hole or passage 4a, which extends from a point near its rear end to and through the cutting end of the drill steel. This hole or passage is utilised as a conduit through which the water is conducted to or in proximity to the cutting end 4b of the drill or bit 4. When it is desired to remove the drill 4 the lever 26 is moved forward around the fulcrum 29 through an angle of 180 degs. more or less into its other extreme position. This moves the flexible supply pipe 15, through the U-bolt 23 and clamp 18, in a direction away from the drill steel 4, and so allows of the easy removal of the latter. As shown in fig. 2, the centre of the hole 27 is at the rear of the centre of the fulcrum pin 29 when the lever 26 is in the position in which it is shown in fig. 2. This results in the lever 26 being locked against unintentional release. The pull of the hose pipe on the U-bolt 23 tends to keep the lever 26 in its locked position. (Seven claims.) 24263 (1914). Improvements in Vertical Tubular Boilers adapted to be Heated by Means of Waste Gases. A. Dietzius, <$f 3, Horstweg, Charlottenburg, and the Warme- Verwertungs-Gesellschaft m.b.H., of Siemensstadt, near Berlin, Germany.—In accordance with the invention there is formed or provided .in one of the passages through which the waste gases escape, such for instance, as a chimney flue, an aperture over which there is fitted a vertical tubular boiler, through the tubes of which the gases flow in such manner that the point at which the gases enter the tubes is located close to the point at which they escape from them. In the flue itself there is provided a valve device to permit either of the direct passage of the gases through the flue or of the diversion of the whole or of a portion of the gases through the tubes, and of their return to the flue adjacent to but on the opposite side of the valve arrangement, which thus enables the output of the boiler to be very promptly regulated. A vertical tubular boiler such as described possesses the further advantages that it can easily be worked on the counter-current principle, the flow of the gases and the water circulation taking place in close contact and in opposite directions, as indicated by arrows in figs. 3 and 4; whilst a portion of it can, moreover, be adapted to serve as a steam superheater. In the apparatus according to this invention illustrated by way of example in the accom- panying drawings, a indi- cates the flue in which there is provided an aper- ture b, above which the tubular boiler c is erected. This boiler is furnished with tubes d, which terminate in the bottom plate e of the boiler. In the constructions shown in figs. 1 and 3 the tubes d are U-shaped; these may, however, be V- shaped, or bent to a sinuous form as shown in fig. 2, or they may be straight as shown in fig. 4. For the purpose of regulat- ing the flow of the waste gases, an arrangement com- prising valves f is provided in the flue, or a partition wall g may be pivotally mounted as shown in fig. 1, so that it can be folded down to permit of the direct passage of the waste gases through the flue a when desired. As the boiler is so arranged that flame cannot come directly into contact with it, tubes may in some cases be permitted to pass through its steam space without risk of their becoming incandescent and consequently giving rise to an explosion. An arrangement of this kind is illustrated in fig. 3, wherein the steam space of the boiler is divided by means of a partition or diaphragm h into the boiler space i proper, and a steam-collecting and superheating chamber k ; the tubes passing through this upper portion k and at the same time superheating the steam which passes from the boiler space i into the superheater chamber k. For the pur- pose of regulating the water circulation it is advantageous to provide an insulating partition Z, preferably consisting of two walls, the space between which is filled-in with some insulating material. This arrangement enables the water space to the right of the partition I to be employed as a feed-water heater, with the result that within a single con- struction, such as described, there is contained a feed-water heater, a steam boiler, and a superheater. When the waste gases which pass through the tubes are such as easily to precipitate deposits, there may advantageously be sub- i stituted for the bent tube arrangements of figs. 1 to 3, a straight tube arrangement such as shown in ng. 4. (Six claims.) _______________________________ NEW PATENTS CONNECTED WITH THE COAL AND IRON TRADES. Applications for Patents. 13048. Gas supply regulators or governors. J. E. Bentley. 13065. Chain or like links. J. Merritt. 13067. Means, methods, and processes for burning pulverised fuel. J. E. Muhlfeld and V. Z. Caracristi. 13076. Equalising chambers for gas producers. C. A. M. Buckley and C. M. T. Olsson. 13098. Aerial railways. E. Odazio. 13100. Treating xylene and other similar aromatic hydro- carbons. W. F. Rittman. 13107. Vessel capable of being used as a coaling boat, fuel- ling steamer, or grain elevating steamer. A. Muir. 13126. Boring bars. H. Austin. 13131. Appliances for the utilisation of heat in horizontal flues of steam generators. M. Mallett, legal representative of E. M. Mallett (deceased) and W. A. Harris. 13142. Rock drills or impact engines. G. W. Howell. 13168. Recovery of metal from scrap or waste sheet metal or sheet metal articles. H. A. Leaver and H. H. Hosack. 13241. Working points or switches on light railways or haulage tracks. A. Rogers. 13253. Apparatus for discharging coke. S. N. Wellington. 13254. Apparatus for charging retorts. S. N. Wellington. 13269. Aerial railways and suspended ways, and like haulage and conveyor installations. W. L. Hamilton. 13270. Aerial railways and like haulage and conveyor systems. W. L. Hamilton. 13311. Bundling apparatus for steel turnings. J. Jackson and H. B. Jackson. 13325. Recovery of metals from slags. C. Vautin. 13328. Fastening railway wagon and like doors. G. B. Bowles. Complete Specifications Accepted. (To be published on October 7.) 1914. 13934. Carbonising fuels. Duckham. 18559. Recovery of ammonia in the form of sulphate from gases. Rigby, and Wetcarbonizing Limited. 19566. Processes for the manufacture of trinitrotoluene. Soc. Italiana Prodotti Esplodenti, and Quartieri. 19645. Machine for compressing explosive substances and ejecting the same from the moulds after com- pression. Soc. Italiana Prodotti Esplodenti, and Quartieri. 19750. Destructive distillation of bituminous coal. Blythe. 19847. Gas washers. Pope. 19854. Electric signalling systems, particularly for use in mines. Sterling Telephone and Electric Com- pany, and Barclay. 20609. Process for the production of tin iron matte from pyritic or other tin ores, tin ore concentrates, tin waste, tin-plate waste, stanniferous slag, and the like. Rueb. 20687. Means for rendering air, damp and water tight the junction of electric wires or cables with boxes or casings containing electric apparatus or the like. Holmes and Brierley. 22081. Fluid compressors. Rendell. 1915. 792. Rolling mills. Fawell. 6998. Fuel levelling devices for gas producers. Morgan. 7541. Apparatus for treating liquid hydrocarbons for the production of hydrocarbons of lower boiling points. Wade. (Standard Oil Company.) ______ 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 proprietor, the law does not apply. 1673/08. Furnaces; retort furnaces. The retorts of a fur- nace for treating coal, ore, etc., are supported on the enlarged ends of pillars, which extend down to the foundations of the furnace. The gas and air channels are so arranged that combustion takes place between the enlarged portions of the pillars, and thus the side walls of the retorts are not subjected to the fiercest heat. No heat- ing conduits are formed in the supporting pillars. H. Ries, Germany (dated January 26, 1907). 1803/08. Governors. The weights of an astatic centrifugal governor are carried on supports, having knife or rounded edges. The weights are mounted in a drum, the centrifugal force acting against springs placed in a recess between heads on cross bolts and the backs of the weights. The regulation transmission lever carries a bolt entering a recess in the weights. Pairs of knife- edge supports may be used on either side of the transmission lever, or one pair may be replaced by a single support; or a pair of supports can be used in the centre of the weights with pivoted levers, similar to the transmission lever, hold- ing the weights on the knife edges. R. Temple, Germany. 2399/08. Ammonium sulphate. Ammonium sulphate is obtained as an almost neutral solid in the process of absorbing ammonia from the mixture of steam and ammonia obtained by distilling organic materials, cooling out the ammonia together with the contained water vapour, and distilling off the ammonia by means of steam, with the addition of lime. According to the present invention, one or more gases, for example, the tar-freed distillation gases of the process, are added to the mixture to reduce the partial pres- sure of the steam without reducing the total pres- sure of the mixture, so that a cooler absorption acid can be used without fear of its dilution. H. Hoppers, Germany. 3756/08. Steam generators; water tube boilers. In a boiler consisting of two systems of tubes arranged directly above the furnace, the water circulates through the lower and more highly heated system at a greater rate than it circulates through the upper system. W. Schmidt, Ger- many (dated May 11, 1907). 28562/06. Dynamo-electric machines. In starting electric motors, the starting resistances are automatic- ally cut out, as the motor speeds up, by an electro-magnetic switch, the movement of which is controlled or retarded by an electro-magnetic relay in the main circuit. The switch also introduces resistance, if the motor is overloaded. The apparatus is adjustable as to the starting and overload currents. F. Krupp Akt.-Ges., Germany (dated March 22, 1906). *** Copies of any of the above specifications can be supplied at the price of Is. post free. ____________________________ GOVERNMENT PUBLICATIONS. *** Any of the following publications may be obtained on application at this office at the price named post free. Consular Reports, etc. : Grenada, Report for 1914-15, 3jd.; Bermuda, 1914, 2d.; Argentine Republic, Rosario, 2d.; U.S.A., Hawaii, 1913-14, l|d.; China, Foochow, 1914, 2|d.; France, Brest, 2d.; Consular Reports Index, 1914, l£d. Boiler Explosion Reports : (No. 2374), Steam Drifter “Charity,” 2|d.; (No. 2376), Ferguslie Thread Works, Paisley, 4^d.; (No. 2375), Steam-heated Oven at Stirchley, 4|d. Great Central Railway Act, 1915, 6|d. Board of Education : Grants Available from the Board in Aid of Technological and Professional Work, ljd.; Educa- tional Pamphlets, No. 30, 5d. Statutory Rules and Orders, 1915 : (No. 826), Friendly Society, l|d. General Report on Railway Accidents in 1914, 3d. Port of London Authority : Sixth Annual Report, 1914-15, 4d. ________________________ PUBLICATIONS RECEIVED. The British Coal Trade. By H. Stanley Jevons. London : Regan Paul, Trench, Triibner and Company Limited. Price, 6s. net. “ The Journal of the Monmouthshire Colliery Officials’ Asso- ciation ” (Vol. 3, No. 6), September; “ The Mining Maga- zine ”, (Vol. .13, No. 3), September, price Is.; “Quin- quennial Review of the Mineral Production of India, 1909- 1913,” by Sir Thomas H. Holland and L. Leigh Fermor (Records of the Geological Survey of India, Vol. 46, 1915, published by Kegan Paul, Trench, Triibner and Company, London), price Rs. 2; “The Engineering Magazine” (Vol. 49, No. 6), September, price Is.; “ Monthly Bulletin of the Canadian Mining Institute,” No. 41, September. ____________________________ Grimsby Coal Exports.—-The coal exported from Grimsby during the week ended Friday, September 17, consisted of the following :—Foreign : To Dieppe, 2,568 tons; Esbjerg, 165; Gothenburg, 7,287; Kerteminde, 301; Ronne, 1,170; Rotterdam, 1,613; and Savona, 2,514 tons. Coastwise: To London, 550 tons—a total of 15,618 tons foreign, and 550 tons coastwise, as against 16,224 tons foreign during the corresponding period last year. Mine Managers’ Certificates.—An examination for first- and second-class certificates of competency as manager and under-manager of mines will be held on November 23, at Edinburgh, Newcastle-upon-Tyne, Sheffield, Wigan, Cardiff, and Birmingham. An examination for certificates of quali- fication as surveyor of mines will be held at the same places on November 24. Candidates must, on or before October 9, send their names and state the district in which they are employed, to the secretary to the Board for Mining Examina- tions, at the Home Office. Whitehall, London, S.W., from whom all particulars can be obtained. United States Imports and Exports of Coal.—The follow- ing is a comparative statement of coal imports and exports of the United States for June 1914-15, and for the 12 months ending June 1914-15, in long tons :— June. Twelve months. Imports :—From 1914. United Kingdom ... 341 . Canada __________ 67,511... Japan ............ 1,838... Australia and Tas- mania .......... 21,896... Other countries ... 5... 1915.' 1914. 1915. -— 11,025.. 33,919 85,525". . 1,005,693.. . 1,121,810 11,750 . 85,689.. 89,240 21,094... . 251,977.. 182,041 350 .. 3,618.. 2,598 118,719... 1,358,002... 1,429,608 ______ Total ......... 91,591... Exports:— Anthracite : Canada .........427,719... ......... Uruguay ............ — ... Other countries ... 5,546... 352,234 .. 3,897,365... 3,621,234 5.. 84... 5 397... 61,665... 60,949 Total ..........433,265... ............... Bituminous : Italy ................ — ... Canada .............793,856 .. ............. Panama .......... 25,81o... Mexico .............. 15,8t6.. Cuba ............... 81,575... West Indies........ 45,433 Argentina.......... 9,977... Brazil............... 10,023... Uruguay .......... 6,200... Other countries....196,826... 352,636... 3,959,114... 3,682,188 383,019... — ... 1,628,279 873.239.. .11.472.397... 8,425,103 47.708.. . 362,427... 343,372 22.445.. . 296,392... 391,611 74.984.. . 1,129,954... 1,065,206 48.406.. . 577,541... 461,892 157.831.. . 139,409... 563,889 122,484 .. 239,082... 527.264 11.968.. . 62,452... 103,639 191,326 .. 1,425,312... 902,740 Total........ 1,185,566.\1,933,410.. .15,704,966.. .14,412,995 Bunker coal........868,736... 727,S08... 7,811,913... 7,062,653 The value of the anthracite coal exported during the 12 months was 19,389,523 dols., and of the bituminous coal so exported 36,516,617 dols. The value of the bunker shipments was 23,676,212 dols. In addition, 602,473 tons of coke, valued at 2,304,475 dols. were exported, as against 742,476 tons, valued at 2,789,814 dols. in 1913-14.