602 THE COLLIERY GUARDIAN. Mabch 13. 1914. The Nut that will not slack back 1 The Nut that will not Drop Off.fi A real Lock Nut has been invented—the “Perfloc” .= The more vibration the tighter it gets, [= Save Money and Ensure Safety | by using the “Perfloc” Nut. | In consequence of the development of our business we — have removed our Head Offices and Showrooms to the t— address below, to which to avoid delay all orders and •— enquiries should be sent. The Engineering Improvement Co. Ltd. 1 4a First Avenue Hotel Buildings, High Holborn, London, W.C. EH Telegrams: “ Perfloc Holb-London.” Teleohone: Holhorn 647. r~~ ROPE DRIVING. FOR EFFICIENCY DURABILITY USE DIPLOMAS OF HONOUR BRUSSELS and TURIN. Illustrated Lecture on— ‘ THE TRANSMISSION OF POWER BY ROPES.” Post Free on Application. Telegrams: “ Kenyon, Dukinfield.” Telephone: 494 Ashton. LONDON OFFICE: 95 & 97, Finsbury Pavement, E.C. Wm. KENYON Si SONS Ltd., CHAPEL FIELD WORKS, DUKINF1ELD, near MANCHESTER. CORES! CORES’ CORES 1 CORES ’ • CT GR"®8 ■i * ’ 1 h’ji THE & Boring Co. Ld. 120, East Ferry Road, Millwall LONDON, E. Boring for Coal and Mineral Prospecting, Artesian Wells, &c. Large Cores a Speciality. Patent Appliances for ensuring the verticality of bore. Contracts completed to date- 60,000 ft., from 500 to 3,600 ft. Core of 8 in. dia. has been produced at a depth of 3»ooo ft. by this system. Estimates Given for any depth or size, Complete Drilling Outfits Supplied for Foreign Contracts. On the Question of “Hot Boxes.” Just Published. Crown Octavo. THE UPKEEP OF PRIVATE OWNERS’ WAGONS. By E.J.H.L. Illustrated by Original Drawings and Photographs. Price 6d. Post free 7d. THE COLLIERY GUARDIAN CO. LTD., 30 & 31, Furnival Street, Holborn, London, E.C. PECKETT & SONS, Bristol. Speciality TANK LOCOMOTIVES. Locos, of various sizes «>peciaUv designed foi Collieries. Ironworks. Contractors, Ac always in stock, Ready for Immediate Delivery Photographs, Prices and Specifi- cations on application. Telegraphic Address—“ Peckett, Bristol.” Telephone—No. 6 Fishponds. ESTABLISHED 1864. ....... Kep-Arrangement “ System Beien.” Unsurpassed in Easy and Absolute Reliable Working. No Breakdowns ! Hundreds in Use ! Strong and Durable Construction. Moderate Prices. ■ sa B ® 1 if ’l Write for Illus- trated Price List. Specialities: 1-ATMES & SAW BENCHES. First class at competitive prices. ROWLAND C. FOOT & Co. 11. Queen Victoria St.. London, E.C Books on Coal Mining. Specimen copies can be seen at the Offices of the ‘‘Colliery Guardian.” s. d. Analyses of British Coals and Coke. Bv Allan Greenwell, F.G.S., and J. V. Elsden, F.G.S., D.Sc. (Lond.) .......10 O Annals of Coalmining: and the Coal Trade. By R. L. Galloway. First and Second Series, 16s. each net, or the two volumes together ........................................ net 25 O Coal and Coalmining;. By the late Sir Warington W. Smyth. Revised and extended by T. Forster Brown ... (postage extra) 3 6 Coal-Cutting: by Machinery in the United Kingdom and America. By Sydney F. Walker and A. S. E. Ackermann. Two vols., 10s. net, or separately..................... 5 0 Coal Dust Experiments, British. A Record of the First Series of Experiments conducted by the Committee appointed by the Mining Association of Great Britain ... (by post, 10s. 7d.) 10 0 Coal Dust Experiments, French. Abstracted Translation. (By post. Is. lid.) .................................. 1 O Coal Dust Experiments, American. Abstract. (By post. Is. lid.) 1 O Coal Dust Experiments, Austrian. Abstracted Translation. (By post, Is. lid.) .................................. 1 O Coal. Being- a Digest of Evidence given before the Royal Commission on Coal Supplies. Edited by Allan Greenwell, F.G.S., Assoc. M.Inst. C.E. Complete in three vols., bound in cloth............................................... net 40 o Coal Trade (History of). By R. L. Galloway .............. 1 O Colliery Manager’s Calculator. By W. Fairley ............ 2 0 Colliery Manager’s Catechism. By W. Fairley ............. 2 O Colliery Management (Some Notes on). Series 1,6d., Series 2 0 6 Colliery Manager’s Handbook. By Caleb Pamely (postage extra) .......................................... net 25 O Colliery Manager’s Pocket Book, Almanac and Diary. Published annually in November ... Cloth 2s., Roan 3s., Calf 4 6 Electric Circuit Problems in Mines and Factories. By E. H. Crapper ......................................... 3 6 Electricity as Applied to Mining. By Lupton, Parr and Perkins 12 O Falls of Stone and Coal. Abstract of the Report of the Prussian Commission on limbering 191 diagrams ................. 1 O Glossary of Terms used in the Coalfields of Northumber- land and Durham. By the late <4. C. Greenwell, Author of “ A Practical Treatise on Mine ngineering ” .......... 2 6 Haulage and Winding Appliances used in Mines. By Carl Volk................................................... 8 6 Mechanical Engineering of Collieries. Bv T. C. Filters. Vol. 1. 21s. net; Vol. 2, 10s. 6d. net; Supplementary Vol., lOs. 6d. net (postage extra). Mine Surveying (Treatise on). By Bennett H. Brough ... 7 6 Miners’ Nystagmus: Its Causes and Prevention. By T. Lister Llewellyn, M.D., B.S. (Lond.) .......(post free) 6 3 Mining Formulae. By T. A. O’Donahne, M.E., F.G.S., &c., Cloth 7 6 Also in five parts, paper covers ... ...........each 1 O Practical Coalmining. By T. H. Cockin ................... 4 6 Practical Stone Quarrying. By A. Greenwell, Assoc. M.Inst.C.E., and J. V. Elsden, D.Sc.(bond.), F.G.S............ net 12 6 Recovering Coalmines after Explosion and Fires. By W. E. Garforth.................. Cloth Is. 6d., Leather 3 6 Ventilation (Colliery). By J. Stanley James.............. 2 O Ventilation Made Easy. By W. Fairley .................... 0 6 Apply to D. 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