868 THE COLLIERY GUARDIAN. May 5, 1916. fasten on the respirator, by connecting such bands at the back of his head by a device such as a buckle 12. (Two claims.) 10370 (1915). Improvements in and relating to Centri- fugal Compressors. The British Thomson-Houston Company Limited, of 83, Cannon-street, London, E.C. (communica- tion from the General Electric Company, of Schenectady, New York, U.S.A.).—Relates to impellers for centrifugal compressors and particularly to the construction and arrangement of the entrance buckets which direct the incoming fluid to the vanes that impart velocity, and more or less pressure to the fluid passing through. Fig. 1 is a side view of ,a portion of the impeller; fig. 2 is a radial section through a portion of the impeller; fig. 3 is a plan showing .adjacent entrance buckets in place; fig. 4 is a perspective view of one of the entrance buckets ; fig. 5 is a section on line 5—5, fig. 3; fig. 6 is a detail view showing a modification; fig. 7 is a detail plan view’ of said modification; and fig. 8 is a detail view’ of the same. 6 indicates the shaft of a centrifugal compressor, and 7 the impeller vanes carried by the web member 8, said vanes being radially disposed. The web member is formed intwo parts, and integral with each part is a bub 9. Each part of the impeller with its vanes 2^ r—— / M /)] Wy ]//[ \°\ \ I I MIK it is cast as a unit, after which the various surfaces are machined to their proper dimensions. The impeller is carried on the shaft by the snug fitting rings 10 and the sleeves 11, over which the outer ends of the hubs slip. The impeller is of the balanced thrust type, which receives fluid at both sides near its axis, discharging it at the periphery. 12 is a bucket supporting ring tightly fitted over the end of the hub, and provided with spaced undercut slots 12", into which the bases of the entrance buckets fit. Each bucket comprises a dove-tailed base 13 to fit the slots 12 a, on which is supported the body member 14, which forms the entrance bucket proper, and suitably shaped to guide the entering air into the spaces between the vanes 7. On the peripheral edge of the body member on the side next to the vanes is one or more ears 15, which fit over the side of and are attached to the adjacent vanes by pins or rivets 15*. The top of the body member is also provided with circumferentially extending projections 16 and 17 forming a head. When the entrance buckets are assembled, the heads of adjacent buckets abut against each other to form a continuous ring (fig. 1). The purpose of these heads or projections is to stiffen the buckets against stresses, and secondly to prevent vibrations, which vibrations might result in cracking or breaking the buckets near their bases. As the bases 13 have either curved or inclined straight edges, and fit into diagonal slots in the ring 12, the abutting faces of the heads are shaped to correspond so that the buckets can be slipped into place one after the other, and be wedged into place. Independent movement of the bucket heads, both axially and radially is prevented by one or more circumferential grooves 18 in the periphery of the projections, in which is wound a number of turns of binding wire 19, the ends being fastened as shown at 20 in fig. 5. The binding wire or band acts as a damper to prevent vibration or fluttering of the buckets; secondly, it helps to carry the load on the bucket bases; and thirdly, prevents the heads from working out of line. After the entrance buckets are assembled in place, a ring 21, as shown in fig. 2, is shrunk on over the hub of the impeller to hold the supporting ring 12 in place and also prevent the bucket bases from working out of their dovetail grooves or slots. The hub and ring 21 are provided with interlocking shoulders, as .shown at 22. The buckets are firmly anchored to the hub of the impeller and are rigidly attached to the impeller vanes. The members 16 and 17 form later support for adjacent buckets, and are very firmly held in relation to each other by the binding wire, thus preventing fluttering or vibration of the buckets. The projections 16 and 17 form a continuous ring around the outer peripheral edge of the entrance buckets. In the modification shown in fig. 6, 24 indicates the outer or peripheral edges of the buckets, and 25 the ring surrounding the same. The ring 25 is provided with diagonal slots or grooves 26 in its inner sur- face, into which the milled edges of the buckets snugly fit as best shown in figs. 7 and 8, and the ring and buckets are also formed with interlocking shoulders 27. (Five claims.) The Yorkshire Hennebique Construction Company, Leeds, have erected at No. 2 pit, Bentley Colliery, Doncaster, a new heapstead of ferro-concrete on the Mouchell-Hennebique system. The dimensions are approximately 183 ft., 32 ft. wide, and 64 ft. high from foundation level to the top of the roof. The height from the same level to the centre of the headgear sheaves is 109 ft. The mouth of the pit is enclosed by a concrete block 6 ft. square, forming a foundation for the headframe. From this foundation rise four main columns 36 in. square, which continue to the top of the beadframe. There are also four 18 in. square columns sup- porting the roof. Further, the concrete block acts as a foundation for eight columns in the main buildings, and four columns carrying the exterior gangway at Horsehole level. HEW PATENTS CONNECTED WITH THE COAL AND IRON TRADES. Applications for Patents. [Note.—Applications arranged alphabetically under the names of the applicants (communicators given in italics). A new number will be given on acceptance, which will replace the application number.] Alexander, R. M. and Bells, C. I. (6053). Expansible fluid pressure engines. Beijcr, A. (5978). Power transmission and control. British Thomson-Houston Company (General Electric Com- pany) (6160). Electric motor control systems. Bugatti, E. (5992). Internal combustion engines. Christopher, J. E. (6087). Gas cooling apparatus. Clarkson, T. (5930). Friction members of clutches and brakes. Clarkson, T. (5935 and 5936). Clutch and brake operating mechanism. Deighton, W. (6115). Steam generators. Emmens, H. and Fagan, J. W. (6037). Manufacture of fire- bricks. Evans, B. A. (5889). Ingot charging peel. Hailwood, J. (6148). Apparatus for gas firing, or a com- bination of gas firing and coal firing, steam boiler, etc., furnaces'. Heyl, G. E. (5985). Manufacture of fuel briquettes. Holroyd, T. H. (6069). Internal combustion apparatus for generating power. Holt, R. B. (5972). Points for tramways, railways, etc. James, T. S. (5888). Internal combustion engines. Lane, J. B. (5912). Apparatus for pouring molten metal, etc. Lang, C. R. (6155). Centrifugal pumps. Maschinenfabrik Oerlikon (6114) High power and speed turbine plant. Matthew, W. (5994). Pistons. Nash, J. G., Tinsley, W. P. (5899). Gas burners for smelt- ing and heating. Nash, J. G. (5902). Gas generators. Newton, Chambers and .Company (5942). Process for removal and recovery of carbon dioxide from mixtures of inert gases with carbon dioxide. Nield, W. H. (6078). Furnaces. Poulsen, H. G. R. (6166). Internal combustion engines. Rockefeller Motor Company (6000). Shaping and tamper- ing metal. Roy, N. B. (5982). Driving belts, conveyor bands, etc. Shaw, C. M. (6143). Steam generators. Shaw, H. S. Hele- (6007). Pipe and cylinder flange joints. Trist, A. R. (6012). Means for dispensing coloured liquids to gauges for indicating level of liquids in steam boilers, etc. Trist, A. R. (6013). Packing rings for pistons, plungers, piston rods, etc. Walker, G. H. (5883). Reciprocating engines and air and gas compressors. Walker, J. H. (6173). Cranes, derricks, and shear legs. Weir, G. and J. (6155). Centrifugal pumps. White, A. E. (American Alloys Company) (5989). Metal alloys. Wilkinson, F. A. (5921). Using paraffin or crude or heavy oils, etc., in internal combustion engines. Wilton van Beede, A. A. (6125). Axial-flow turbines. Complete Specifications Accepted. (To be published on May 18.) 1914. 56. Apparatus for purifying the air in mines and works. Allen. 1915. 4190. Thermo-statically controlled valve mechanism for steam traps, calorifiers, and the like. Royles Limited, Boyle, and Boyle. 4682. Purification of coal and other gases. Wilton. 6005. Chain joints. White (National Malleable Castings Company.). 6011. Pressure relief valves for use in connection with engine cylinders. O’Donnell and Geer. 6156. Condensing steam turbine.plants. (Cognate Applica- tions, 10732/15 and 14476/15.) Baumann. 6233. Internal combustion engines. Pratt. 6312. Combustion of gaseous or vaporous fuels. (Cognate Application, 7920/15.) McCourt, and Commercial Laboratories Limited. 6323. Furnaces. Smallwood. 6330. Apparatus for introducing goods into and removing -same from annealing and other furnaces. 6490. Two-stroke cycle internal combustion engines. Croset. 6499. Bailway signalling apparatus. Tiddeman. 6602. Keys for securing railway or like rails in their sup- porting chairs. Williamson. 7106. Buffers of railway wagons and the like. Ramsden 9635. Winding devices for conductors conveying power to movable electrically driven machines. Cassel. 10770. Liquid fuel supply apparatus for internal combustion engines. Higginson and Arundel. 15829. Valves for controlling the flow of -steam, air, or other fluid. Steam Fittings Company, and McLeod. 1916. [Note.—The numbers following the applications are those which the specifications will finally bear.] 1101. Construction of valve mechanism for steam engines. G. M. Addison. 100290 GOVERNMENT PUBLICATIONS. :N?^Any of the following publications may be obtained on application at this office at the price named post free. Be view of the Trade of India, 1914-15, 2s. 3d. Trade and Consular Reports, 1914-15 : East Africa, 4Jd. ; Nyassaland, 2d. Statutory Bules and Orders : No. 212, Income-Tax, Weekly Wage-Earners Regulations, IJd. Grimsby Coal Shipments.—The official return shows that during the week ended April 28,.the only shipment of coal from Grimsby was one of 203 tons to Dienne, as compared with a total of 9,124 tons in the corresponding week of last year. PUBLICATIONS RECEIVED. The Value of Science in the Smithy and Forge. By W. H. Cathcart. London : Charles Griffin and Company. Price, 4s. net. Kelly’s Directory of the Merchants, Manufacturers, and Shippers of the World for 1916. London : Kelly’s Directories Limited. Price, 36s. South Wales Coal and Iron Companies, 1916. Compiled by E. Sully. Cardiff : The Business Statistics Company. Department of the Interior, United States Bureau of Mines : (Technical Paper 108), “ Shot-firing in Coal Mines by Elec- tricity Controlled from Outside,” by H. H. Clarke and others; (Technical Paper 114), “Pleat Transmission Through Boiler Tubes,” by H. Kreisinge-r and J. F. Barkley. “ Monthly Statement of Coal Mine Fatalities in the United States, October and November 1915,” com- piled by A. H. Fay: (Bulletin 74), “ Gasoline Mine Loco- motives in Delation to Safety and Health,” by O. P. Hood and B. H. Kudlich, with a chapter on “ Methods of Analysing Exhaust Gases,” by G. A. Burrell; (Bulletin 97), “ Sampling and Analysing Flue Gases,” by H. Kreisinger and F. K. Ovitz; (Bulletin 99), “ Mine Ventila- tion Stoppings, with Especial Beference to Coal Mines in Illinois,” by B. Y. Williams; (Bulletin 100), “Manufac- ture and Uses of Alloy Steels,” by H. D. Hibbard; (Technical Paper 112), “ Determination of Nitrogen in Coal,” by A. C. Fieldner and C. A. Taylor; (Technical Paper 112), “ The Explosibility of Acetylene,” by G. A. Burrell and G. G. Oberfell. “ Fifth Annual Report by the Director of the Bureau of Mines to the Secretary of the Interior for the Year ended June 30, 1915.” Mines Branch of the Canadian Department of Mines : “ The Production of Coal and Coke in Canada During 1914 ” ; “ The Produc- tion of Iron and Steel in Canada During 1914,” by J. McLeish; “ Preliminary Beport on the Mineral Production of Canada During 1914,” by J. McLeish; “ The Produc- tion of Cement, Lime, Clay Products, Stone, and other Structural Materials in Canada During 1914,” by J. McLeish; “ The Production of Copper, Gold, Lead, Nickel, Silver, Zinc, and other Metals in Canada During 1914.” “ The Journal of the Western Society of Engineers ” (Vol. 20, No. 7), September and October .1915; “Journal of the Franklin Institute ” (Vol. 181, No. 4), April; “ The Journal of the Chemical, Metallurgical, and Mining Society of South Africa ” (Vol. 16, No. 7), February; “ Monthly Bulletin of the Canadian Mining Institute ” (No. 48); April; “ Statistics for February of the Department of Mines and Industries of the Union of South Africa”; “ Transactions of the Mining Institute of Scotland ” (Vol. 38, Part 3); “ Bulletin No. 139 of the Institution of Mining and Metallurgy ”; “ Trade of the Union of South Africa, Southern and Northern Rhodesia, and British South Africa for January 1916,” price 3s. 6d.; “ Records of the Geolo- gical Survey of India ” (Vol. 45, Part 4) (London : Kegan Paul, Trench, Trubner and Company), price Bs. 1; “ Annales des Mines, Partie Administrative ou Recueil de Lois, Decrets, Arretes et autres Actes ” (Onzieme Serie, Tome 4) (Paris ; H. Dunot et E. Pin at); “ The Iowa Engineer” (Vol. 16, No. 6), March; “Compressed Air Magazine” (Vol. 21, No. 4), April; “The Naturalist” (No. 7'12), May. CATALOGUES AND PRICE LISTS RECEIVED. A booklet issued by the Chicago Pneumatic Tool Company illustrates some types of compressors and fuel oil and gas engines. The Electrical Supplies Company (235, Tottenham Court- road, London, W.) have forwarded catalogue of electrical accessories, including lamp and conduit fittings, ironclad switchgear and fuses, combined switches and fuses, etc. The British Insulated and Helsby Cables Limited (Prescot, Lancashire) forward an illustrated description of their Helsby pattern zinc rod for Leclanche cells, which is of double-taper section, the amount of material being reduced in those parts where there is little or no ection. The Power Gas Economy Company (50, Wellington-street) send leaflets describing Hunter and Terbeek burners for attachment to boilers in order to burn blast furnace, coke oven, and producer gas, either alone or in conjunction with solid fuel. The Hunter fire grate is adapted for burning fine- grained poor fuels, the design of the bars enabling the air to rise in thin streams and broken lines all over the grate. The Sullivan Machinery Company (Salisbury House, London, E.C.) have recently issued a handsome new catalogue describing Ironclad longwall coal cutters, both turbinair and electrically driven. The illustrations show this coal cutter in use in various British mines, and details of the turbinair and electric motors. Particulars are also given of the cutting capacity and power consumption of the machine. The Hardy Patent Pick Company Limited (Sheffield) for- ward catalogue of the Hardy Simplex hammer drill on special mounting for driving, stoping, raising, etc. A Hardy water spray can be attached, for keeping down dust, though, where practicable, the injection of water through the hollow steel, to the bottom of the hole, is preferred, in w’hich case the hollow steels pass through a water injection box. The water may be taken from the pump mains, etc., or from a 20-gal. tank, with a connection for admitting compressed air to pro- duce the necessary pressure. Messrs. Erith’s Engineering Company Limited (70, Grace- church-street, E.C.) send us a copy of a catalogue dealing with the Erith-Biley underfeed stoker. In these stokers no grates are used, the fuel-bearing surfaces being imperforate, whilst the fuel bed is always in three layers. The lowest layer is the unburnt coal in the fuel retorts; the middle layer is coal in the process of coking, as it is fed upwards from the retorts and over moving tuyeres, which admit air across the retorts. The gases distilled in the middle layer are subse- quently burnt without smoke, as they pass through the top layer or incandescent fire zone. The patents cover the feature of reciprocating tuyeres and ash pushers, which enable cleaning to be automatically effected. An automatic speed control system is also adapted. Lady Beatty is asking for gifts towards the excellent work of the British and Foreign Sailors’ Society, an organisation which has its headquarters at the Sailors’ Palace, Commer- cial-road, London. The society is international and inter- denominational, and possesses a -record of valuable service among sailors. The annual meeting will be held at the Mansion Hu.use on May 8.