February 27, 1914. THE COLLIERY GUARDIAN 489 JOHN SHAW LTD., Yorkshire Wire Rope Works, SHEFFIELD, ENGLAND. STEEL WIRE ROPES OF EVERY DESCRIPTION. JOHN SHAW (AUSTRALIA) LD., 445, Kent Street, Sydney. Electrical Plant & Accessories. CABLES & SWITCHES, CARBON & METAL LAMPS. MINING TELEPHONES, HASLAM & SCHONTHEIL L? ^thob"'- II, Windsor Place, CARDIFF. ■■aHIMMHHMHHnKBHIIMMBHRBMHMEMBHHRS Price 3S. 6d. post free. A Practical Handbook for Colliery Electricians. ELECTRIC CIRCUIT PROBLEMS in Mines and factories. — BY — ELLIS H. CRAPPER, B.Eng., M.I.E.E., Head of the Department of Electrical Engineering at the University of Sheffield. THE COLLIERY GUARDIAN CO. LTD., 30 & 31, Fumival Street, Holborn, London, E.C. ! / THE SOCIETE de FONCAGE de PUITS FRANCO- BELGE. CAPITAL-1,350,000 fcs. ..' undertakes Prospecting, Pit Sinking, Repairing Shaft Linings, and Tunnelling. A Special Feature is made of : Shaft Sinking by a patented process of percussion drilling combined with the injection of heavy liquid ; also of Hardening and Drying Water- bearing Strata by the freezing process and by the Portier and Saclier Processes (Injection of Cement under Pressure). Up-to-date Processes & Plant. Numerous Installations. HEAD OFFICES : Bvd. du Nord (40, Rue de Malines), BRUSSELS. Telephone—3415 A Brussels. Telegraphic Address—Foncage, Bruxelles. Gas Tubes ano Fittings Lewis, Edwin, and Sons, Wolverhampton Stewarts & Lloyds Ld., Birmingham A Glasgow Wellington Tube Works Ld., Great Bridge, Tipton Gas Valves Haslam and Schontheil Ld., Bristol “ KSB” Manufact’ng Co., 13, Wa ’ gate, Sheffield Gauge Glasses Butterworth Bros. Ld., Newton Heath, Man- chester Davis, John, and Son (Derby) Ld., Derby Guilbert-Martin, 9, Edmund-pl„ Aldersgate, E.C. Hopkinson, J., and Co. Ld., Huddersfield Boyles Ld., Irlam, Manchester Teale, W. E., and Co. Ld., Swinton, Lancs. Theedam, E. C„ Ld., Dudley Treasure, J. B., & Co., 8 A12, Vauxhall-rd., L’pool Gauge Class Protectors Butterworth Bros. Ld., Newton Heath, Manch’er Davis, E.» 2, Aire-street, Leeds Hopkinson, J., and Co. Ld., Huddersfield Boyles Ld., Irlam, Manchester Teale, W. E., and Co. Ld., Swinton, Lancs. Theedam, E. C., Ld., Dudley Gauges Green and Boulding Ld., 28, New Bridge-st., E.C. Hopkinson, J., and Co. Ld.. Huddersfield Gear (Special for Motor Lorries Cars &o.) Brown, David, A Sons (Hudd.) Ld., Huddersfield Gearing British Insulated and Helsby Cables Ld., Prescot Brown, David, A Sons (Hudd.) Ld., Huddersfield Bumsted and Chandler Ld., Hednesford. Staffs. Coventry Chain Co. Ld., Coventry Daglish, Bobert, and Co. Ld., St. Helens, Lancs. Jardine, John, Deering-street, Nottingham Lancaster and Tonge Ld., Pendleton, Manchester Leech, Goodall A Co., Hunslet, Leeds Walker Brothers (Wigan) Ld.. Wigan Wild, M, B„ and Co. Ld., Nechells, Birmingham Wood. John, and Son Ld., Brook Foundry, Wigan Girders (Iron and Steel) Daglish, Bobt., and Co. Ld., St. Helens, Lancs. Firth, Wm., Ld., Greek-street Chambers, Leeds Heenar and Froude Ld., Manchester Henderson and Glass, Liverpool Isca Foundry Co.. Newport, Mon. Johnston, John, Attercliffe Boiler Wks., Sheffield Benton, B. M., and Co., Midland Works, Sheffield Scott, Walter, Ld., Leeds Steel Works, Leeds Shelton Iron, Steel and Coal Co. Ld., Stoke-on- Trent, Staffs. Ward. Thos. W.. Limited. Albion Works, Sheffield Glass Manufacturers (Tube Rods Enamels) Butterworth Bros. Ld., Newton Heath, Manch’er Guilbert-Martin, 9, Edmund-pl., Aldersgate, E.C. Governors (Engine) Evans, Joseph, and Sons (Wolverhampton) Ld., Wolverhampton Hollingdrake. Henry, and Son, Ld., Stockport Mather and Platt Ld., Manchester Daglish, Bobt., and Co. Ld., St. Helens, Lancs. Tangyes Ld., Cornwall Works Birmingham Governors (Hydraulio) Crease Chorley Bailway Wagon Co. Ld., Chorley, Lancs. Trier Bros., Caxton House, Westminster Theedam, E. C., Ld., Dudley Thomas and Bishop, 119-125, Finsbury Pav., E.C. Wakefield, C. C., A Co., Cheapside, London, E.C. Grinding Maohinery Bradley Pulverizer Co., 37. Walbrook Bridge, David, A Co. Ld., Castleton, Manchester Hardy Patent Pick Co. Ld.. Sheffield Johnson, Wm., &Sons (Leeds) Ld., Armley, Leeds Grinding Mills (Horse Provender) Porteus, George, Leeds Bridge, Leeds Gunpowder Curtis’s and Harvey Ld., Cannon-st. House, E.C. Forces Hardy Patent Pick Co. Ld., Sheffield Keith, James, & Blackman Co. Ld., 27, Farring- don-avenue, London, E.C. Standard Engineering Co. Ld., Leicester Forqinos Bagnall, W. G., Ld., Stafford Carron Co., Carron, Falkirk Chorley Bailway Wagon Co. Ld., Ghorley Hardy Patent Pick Co. Ld., Sheffield Lowmoor Co. Ld., Lowmoor Ironworks, Bradford Benton ,B. M., and Co., Midland Works. Sheffield Walker Bros. (Wigan) Ld., Wigan Wright’s Forge and Engineering Co. Ld., Tipton Yorkshire Engine Co. Ld. Sheffield Friotion Clutches _ Bever, Dorling, and Go. Ld., Bradford, Yorks. Bridge, David, & Co. Ld., Castleton, Manchestei Daglish, Bobert, and Co. Ld., St. Helens, Lancs. Longbotham, B. H., and Co. Ld., Wakefield Norton’s (Tividale) Ld„ Tipton Beavell and Co. Ld., Ipswich Beddaway, F„ & Go. Ld., Pendleton, Manchester Theedam, E. 0., Ld., Dudley Walker Brothers (Wigan) Ld., Wigan Wild, M. B„ and Co. Ld., Nechells. Birmingham Wood, John, & Sons Ld., Brook Foundry, Wigan Wright’s Forge and Engineering Co. Ld.. Tipton Friotion Surfaces Frood, Herbert, co. Ld., Chapel-en-le-Frith ** Scandinavia ” Belting Ld.. 59, Southwark- street, London, S.E. Fuel Economisers Fell, C. A., Dronfield, near Sheffield Pillatt and Co., Stapleford, Nottingham Stringer, John, and Son, Dept. 11, Blackburn Fuel Machinery Johnson, Wm.. A Sons (Leeds) Ld., Armley, Leeds Middleton, Bobert, Sheepscar Foundry, Leeds Yeadon, Son and Co., Albion-place, Leeds FURNA0E8 Bennis, Ed., and Co. Ld., Little Hulton, Bolton Leech. Goodall & Co., Hunslet, Leeds Pillatt and Co. Ld., Stapleford, Nottingham Furnace Ironwork Heenan & Froude Ld., Worcester and Manchester Leech, Goodall & Co., Hunslet. Leeds Wood, John, and Sons Ld., Wigan Fuse Igniters Cotton Powder Co. Ld.,32, Queen Victoria-st., E.C. Curtis’s and Harvey Ld., Cannon-st. House, E.C. Davis, John, and Son (Derby) Ld., Derby Nobel’s Explosives Co. Ld., Glasgow Gas Compressors Beiliss and Morcom Ld., Birmingham Gas Engines British Oxygen Co.Ld., Elverton-st.,Westminster Glover, M., and Co., Holbeck-lane, Leeds Bobey and Co. Ld., Lincoln Stringer, John, and Son, Dept. 11, Blackburn Tangyes Ld., Cornwall Works, Birmingham Gas Exhausters Copp^e Co. (Gt. Britain) Ld., Kingsway, London, Koppers’ (The) Coke Oven and Bye-Product Co., Sheffield Gas Plant Copp^Co. (Gt. Britain) Ld., Kingsway, London Koppers’ Coke Oven & Bye-Product Co., Sheffield Matltier and Platt Ld., Manchester Gas-Testing Lamps Ackroyd and Best Ld., Morley, Leeds Best’s Safety Lamps Ld., Providence W’ks, Leeds Davis, John, and Son (Derby) Ld., Derby Protector Lamp and Lighting Co. Ld., Eccles, Manchester Teale, W. E., and Co. Ld, Swinton, Lancs. Harness Legard and Son. Leather Merchants Barnsley Haulinq Drums Bever, Dorling and Co. Ld., Bradford Bridge, David, A Co. Ld., Castleton, Manchester Bumsted and Chandler Ld., Hednesford, Staffs. Carron Co., Carron, Falkirk Daglish, Bobert, and Co. Ld., St. Helens, Lancs. Lowmoor Co. Ld., Lowmoor Ironworks, Bradford Heenan A Froude Ld., Worcester and Manchester Norton’s (Tividale) Ld.. Tipton Leech, Goodall A Co., Hunslet, Leeds Mining Appliances Co., 32, Church-st., Sheffield Phillips, C. D., Newport, Mon. Bobey and Co. Ld., Lincoln Spencer and Co. Ld., Melksham, Wilts Sutcliffe, B„ Horbury, near Wakefield Walker Bros. (Wigan) Ld., Wigan Wild,M. B., and Co .Ld., Nechells, Birmingham Wood, John, A Sons Ld., Brook Foundry, Wigan Wootton Bros. Ld., Coalville, Leicester Wright’s Forge and Engineering Co. Ld., Tipton Youngs, Byland-street Works, Birmingham Headgears Daglish, Bobt., and Co. Ld., St. Helens, Lancs. Heenan A Froude Ld., Worcester and Manchester Leech, Goodall A Co., Hunslet, Leeds Norton’s (Tividale) Ld., Tipton Bobey and Co. Ld., Lincoln Spencer and Co. Ld., Melksham, Wilts Wright’s Forge and Engineering Co. Ld., Tipton Heading Machines Davis, John, and Son (Derby) Ld., Derby Hardy Patent Pick Co. Ld., Sheffield International Channelling Machines Ld., Sheffield Sullivan Machinery Co., Salisbury House, London Wall, E.C. " Heapsteads Coulson, M„ A Co. Ld., Snennymoor, Co. Durham Hardy Patent Pick Co. La., Sheffield Head, Wrightson and Co. Ld., Stockton-on-Tees Heenan and Froude Ld., Worcester Leech, Goodall A Co., Hunslet. Leeds Longbotham, B. H., and Co. Ld., Wakefield Norton’s (Tividale) Ld., Tipton Plowright Bros. La., Chesterfield Spencer and Co. Ld., Melksham, Wilts Walker Bros. (Wigan) Ld., Wigan Wood, John, A Sons Ld.. Brook Foundry, Wigiu Wright’s Forge and Engineering Co. Ld.. Tipton Yorkshire Hennebique Contracting Co. Ld., Leec s Hoists Bleichert's Aerial Transporters Ld., 36, New Broad-street, E.C. Daglish, Bobert, and Co. Ld., St. Helens, Lanes. Hardy Patent Pick Co. Ld., Sheffield Heenan and Fronde Ld., Worcester Leech, Goodall A Co., Hunslet, Leeds Mather and Platt Ld., Manchester Mavor and Coulson Ld., 47, Broad-street, Glasgow Beavell and Co. Ld., Ipswich Spencer and Co. Ld., Melksham, Wilts Wild, M. B., ard Co. Ld.. Nechells, Birmingham Wood, John A Sons Ld., Brook Foundry, Wisrav Wright’s Forge and Engineering Co. Ld., Tipton Youngs, Bvland-street Works. Birmingham Hooks or Links (Safety) Heenan and Froude Ld., Worcester Humble, Stephen, 9, Victoria-street, S.W. Lowmoor Co. Ld., Lowmoor Ironworks, Bradford Ormerod, Edward, Atherton, near Manchester Walker, Thos., and Son Ld., Birmingham Wood, John, A Sons Ld., Brook Foundry, Wigan Wright’s Forge and Engineering Co. Ld., Tipton HOPPERS Baker, John, and Son, Bilston, Staffs Coulson, M., and Co. Ld., Spennymoor Harvey, G. A., A Co. (London) Ld., Woolwich road, S.E. Hardy Patent Pick Co. Ld., Sheffield Heenan and Froude Ld., Worcester Hoppebs—continued Leech. Goodall A Co., Hunslet. Leeds Simon-Carves Ld.. 20. Mount-street. Mannhaaf^r Spencer and Co. Ld., Melksham, Wilts Theedam, E. 0., Ld., Dudley Wright’s Forge and Engineering Co. Ld., Tipton Yorkshire Hennebique Contracting Co. Ld., Leeds Hose Hardy Patent Pick Co. Ld., Sheffield Mining Engineering (Jo. Ld., Sheffield Norton’s (Tividale) Ld., Tipton Beddaway, F., A Co. Ld., Pendleton, Manchester Willcox. W. H., A Co. Ld., 28, Southwark-st., 8.E Humidifiers Heenan A Froude Ld., Worcester and Manchester Mather and Platt Ld., Manchester Hydraulio Maohinery Daglish, Bobert, and Co. Ld., St. Helens, Lancs. Hathorn, Davey and Co. Ld., Leeds Klein, A., and Co., 38, Church-street, Sheffield Leech, Goodall A Co., Hunslet, Leeds Mather and Platt Ld., Manchester Middleton, Bobert, A Co. Sheepscar F’ndry, Leeds Pearn, Frank, A Co., La., West Gorton, Manchester Pulsometer Engineering Co. Ld., Beading Sullivan Machinery Co., Salisbury House, London Wall, E.C. Tangyes Ld., Cornwall Works, Birmingham Wood, John, A Sons Ld., Brook Foundry, Wigan Youngs, Byland-street Works, Birmingham Hydraulio Reducing Valves Auld, D., and Sons, Whitevale Foundry, Glasgow Hygrometers Davis, John, and Son (Derby) Ld.. Derby Winter. T. B., and Son, 21, Grey-st., Newcastle on-Tyne Inoline Rollers Bagnall, W. G., Ld., Stafford Leech, Goodall A Co., Hunslet, Leeds Lowmoor Co. Ld., Lowmoor Ironworks, Bradford Indiarubber Goods Chorley Bailway Wagon Co. Ld., Chorley, Lancs. Beddaway, F., A Co. Ld., Pendleton. Manchester Indicators (Steam Engine) Davis, John, and Son (Derby) LcL, Derby Induoed Draught Fams Bumsted and Chandler Ld., Hednesford, Staffs. Davidson and Co. Ld., Belfast Heenan A Froude Ld„ Worcester and Manchester Keith, James, A Blackman Co. Ld., 27, Farring- don-avenue, London, E.C. Standard Engineering Co. Ld., Leicester Turbon Patent Fan Co. Ld., Llanelly INJE0T0R8 AND EjEOTORB Bailey, Sir W. H., A Co. Ld., Salford, Manchester Hopkinson, J., and Co. Ld., Huddersfield Pulsometer Engineering Co. Ld,, Beading Willcox, W. H., A Co. Ld., 32, Southwark-st., SJE. Instruction (Postal) Electro-Technical Bureau, 312, Deansgate, Man- chester Southern, T. A., Universal Mining School, Cardiff Thomas, Wm., Cambrian Mining School, Porth Instruments Davis, John, and Son (Derby) Ld., Derby Thornton, A. G., Ld.. King-st. West, Manchester Winter, T. B., and Son, 21, Grey s*., Newcastle on-Tyne Iron and Brass Founders Bridge, David, A Co. Ld., Castleton, Manchester British Wagon Co. Ld., Botherham Chorley Bailway Wagon Co Ld., Chorley, Lenos. Daglish, Bobt., and Co. Ld.. St. Helens, Lancs. Gosforth Foundry Co. Ld., Dronfield, nr. Sheffield Jardine, John, Deering-street, Nottingham Lowmoor Co. ixL, Lowmoor Ironworks, Bradford Protector Lamp and Lighting Co. Ld., Eccles, Manchester Boyles La., Irlam, Manchester Spencer and Co. Ld., Melksham, Wilts Wood. John, and Sons Ld., Wigan