486 THE COLLIERY GUARDIAN. March 9, 1917. CONTENTS. Editorial Articles page Fuel Research ................................ 487 Money and Prices ............................ 487 Articles Cementation Process as Applied to Mining (Francois System) .................................... 479 Briquetting by the Dutch Oil Process .......... 480 The Mining Engineer on the German General Staff 481 Colliery Workers and Miners’ Federation ....... 482 Explosibility of Coal Dust .................. 482 Signalling with Bare Wires ............v.... 482 The Wood Circular Car Dumper .................. 483 Precautions Against Pit Engine-house Fires .... 483 Interconnecting Electricity Supply System...... 481 Mining Timber Trade of South Wales ............ 484 Sampling Delivered Coal....................... 485 Mining Industry and Military Service .......... 492 Lancashire Miners’ Agents at the Somme Front ... 492 Engineering Specifications and Coal ........... 493 Book Notices....'.............................. 493 Labour and Wages.............................. 494 Obituary...................................... 494 Open Contracts ................................ 498 The Freight Market .......................... 498 Abstracts of Patent. Specifications Recently Accepted...................................... 498 Publications Received.......................... 500 New Patents Connected with the Coal and Iron Trades...................................... 500 The Coal and Iron Trades........................485—491 The London Coal Trade ..................... 491 The By-Products Trade ......................... 491 The Tin-plate Trade............................ 491 Current Science and Technology................... 484 Parliamentary Intelligence ....................... 492 Law Intelligence ............................... 494 Notes from the Coal Fields ........................ 495 Coal, Iron and Engineering Companies ............. 496 Miscellanea :— Coal Alines Control............................ 481 American Coal in France ..................... 482 Miner Woodcutters............................ 485 Managers’ and Under-managers’ Certificates—The , Firth of Forth Coal Field.................... 483 Partnership Dissolved—British Coal for Bordeaux —Swiss Imports of Coal—The Control of Tin- plates—Mentioned for War Services............ 494 France’s Coal Supply......................... 496 Disabled Soldiers’ and Sailors’ Pensions ...... 500 ADVERTISEMENTS. Offices for ADVERTISEMENTS and PUBLICATION- 30 & 31, Furnival Street, Holborn, London, E.C. 4. Telegraphic Address-—“Colliery Guardian, Fleet, London.”H Telephone—1354 Holborn CONTRACT ADVERTISEMENTS : Prices for SPECIAL POSITIONS on application. Prices for ORDINARY POSITIONS Single Column (3 inches wide) : For 52 insertions 2s. 6d. } per ingertion for eaoh „ 13 3b. 6d. ) lncb ln dePth- Double Column (6 inches wide), double the above rates. Three Columns (9 inches wide), three times the above rates. MISCELLANEOUS ADVERTISEMENTS Advertisements are inserted on the last white page or leader page at the following rates :— One insertion ... 10s. Od. per inch per insertion. Three insertions ... 9s. 6d. ,, ,, Six insertions ... ... 9s. Od. ,, ,, A reduction of 25 per cent, is allowed on advertisements of second-hand machinery. Situations Vacant and Wanted : One Penny per word, minimum 2s. 6d. (which must be prepaid). Can be received up to TEN o’clock on Friday morning. 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Formed in 1891 for the Protection of the Rights and Interests of Private Owners. Applications for particulars and terms of membership may be sept to the SECRETARY. Clarence Chambers, Gloucester. The Oldest Diamond Drill Company. Established 1872. PORING for T>rlNEBALS. SPEED AND CERTAINTY. CYLINDRICAL “CORES.” THE AQUEOUS WORKS AND DIAMOND ROCK-BORING Co. LTD. Guildford StmYork Road, Lambeth, London, S.E. Besides numerous other Important Contracts, completed (in 1897) the Deepest Boring in the United Kingdom to.3,500 ft. Great Experience in Boring for WATER. The Cambrian School of Mines, CEMETERY ROAD, FORTH, GLAM. Principal: WILLIAM THOMAS, M.Inst M.B., F.G.S., M.R., Society of Arts. Tutors—Staff of Highly Qualified Instructors in all subjects. an University Training at Your Own Home. Instruction and Lessons by Post for Mine Managers, Surveyors, Electricians, and Mine Inspectors. Since the coining into, force of the New Mines Act 579 Students of this School have been qualified as First and Second-class Mine Managers. 87 students have passed the Home Office Surveyors’ Exam.; 30 students are now Mines Inspectors. 40 passed. First-class Electrical Engineers. Candidates for the aboye write without delay for free Syllabus, and book of Previous Examination Questions. (Dept. C.) CAMBRIAN MINING SCHOOL, PORTH, Clam. Briquette Machinery Ltd., Charmotith Street, LEEDS. Machinery for Briquetting Peat, Lignite, Coke, Coal, Iron, Copper, Nickel, Cement; Also Sawdust, Waste Cereals, Offals, Sewage. PATENT COAL DRIER. The U.M.S. LESSONS BY POST. The best Mining Education^ Unapproachable Successes. 52 H.M. Inspectors are U.M.S. Men. — . Syllabus free. — THE UNIVERSAL MINING SCHOOL «) 50^ Connaught Road, Cardiff. C.M.A. CORRESPONDENCE SCHOOL (Founded by T. A O’DONAHUE, F.G.S., F.S.I.). Complete Courses of Postal Tuition suitable for Home Office Mining Exams Free Syllabus from Secretary, C.M.A. SCHOOL, Leigh, Lancs. YEADONS’ LATEST PATENTED BRIQUETTE MACHINERY, For Coal, Coke, Iron and other Ore's. YEADON, SON & CO., Engineers, LEEDS, Have a World-wide Reputation, and 38 Years’ Experience. They have supplied MORE BRIQUETTE PLANTS . than any other firm in this country. PEEBLES Bruce Peebles & Co. Ltd. ELECTRICAL MACHINERY Engineers, Edinburgh. See our Illustrated Advt. Feb. 23rd. RAILS. RAILS. ALL SECTIONS AND ACCESSORIES. Also quantity F.B. suitable for bearers. Sleepers. Timbers. Switches and Crossings. Buffer Stops. Locomotives. Cranes. Wagons. ARMYTAGE & JONES Ltd., Sheaf Street, Sheffield. STEEL ' Rails Roof Bars Fit Props Arches t For COLLIERIES V and WORKS. THQS W. WARD Ltd., Albion Works, SHEFFIELD. TRY (IS. MARITIME COALINGJIDMINISTRATION Planning of Coaling Stations. Parliament Mansions, Victoria Street, Westminster, England. MACHINE CUT GEARING. Double Helical Staggered or Chevron. JReducmg Oearsn Haulage Gears. Time Recorders & Recording Instruments. Watchmen’s Watches. THE LEWELLYN MACHINE CO., Bristol. Geo. N. Dixon & Co., 43, Castle Street, Liverpool, Auctioneers and Valuers, COLLIERIES, Brickworks & Mining Plant. Auctioneers & Valuers to the Engineering Trades. KNIGHT & PARTNERS Ltd. 27, Old Queen Street, Westminster, S.W. COEEESPONDENC.E INVITED. SALES conducted in all parts of the Kingdom. COAL, IRON & STEEL SHARES. WILLIAM CHAPMAN & COMPANY Stockbrokers. (established since 1851). Cavendish Buildings, Wheeler Gate, NOTTINGHAM. Special Business in Coal, Iron and. Steel Shares. ' Lists, reports, &c., will be forwarded regularly on application. (Colliery Engineer Requires Situation at MODERN COLLIERY, or to OPi^N UP. Wide experience in the most modern fna'hinery. To take full charge. Excellent credentials.— Apply to Box 6692, Colliery Guardian Office, 30 & 31, Furnival-street, Holborn. London, ci.C. olliery Manager desires appointment. Thoroughly practical, acquainted with coal-cutting machines, also se-nns liable to spontaneous combustion.—Box 6694, Colliery Guardian Office, 30 & 31, Furnival-street, Holborn, London, E.C. ’ COAL MINES ACT, 1911. Examination for Certificates as Manager and Under Manager, and FOR CERTIFICATES OF QUALIFICATION AS SURVEYOR OF MINES. n Examination for First- and Second- class Certificates of Competency as Manager and Under-Manager c.f Mines will be held on the 22nd May, 1917, at Edinburgh, Newcastle-upon- Tyne, Sheffield, Wigan, Cardiff and Birmingham. An Examination for Certificates of Qualification as Surveyor of Mines will be held at the same places on the 2,3rd May. Candidates must, on or before the 7th April, send their names, and state the district in which they are employed, to the Secretary at the Home Office, Whitehall, London, S.W.. from whom all partioulars can be obtained W. W. WARE, Secretary to the Board for Mining Examinations COUNTY BOROUGH OF SOUTHAMPTON. TO COAL MERCHANTS AND OTHERS. The Corporation invite Tenders for the supply of COAL to their Electricity Supply Station. Particulars may be obtained upon application to the Borough Electrical Engineer. Sealed tenders, endorsed “Tenders for Coal, Electricity Works,” should be sent to the Town Clerk. No pledge is given to accept any tender. Town Clerk’s Office: R. R. LINTHORNE, Municipal Offices, Southampton, Town Clerk. 2nd March, 1917. COUNTY BOROUGH OF SALFORD. ELECTRICITY DEPARTMENT. Tenders required by 10 a.m. on Monday, 19th March, 1917, for 5,000 tons of WASHED SLACK during the next 6 months. Particulars may be obtained from the Borough Electrical Engineer, Frederick-road, Salford. L. C. EVANS, _______________________________________________Town Clerk. The Proprietor of the British Patent No. 10912/10, dated May 3,1910, relating to “ Mixing Apparatus for Briquette Machines,” is desirous of entering into arrangements by way of a licence or otherwise on reasonable terms for the purpose of exploiting the above patent and ensuring its practical working in Great Britain. All enquiries to be addressed to, HERON ROGERS & DEHN, Broad Sanctuary-chambers, Westminster, S.W. For Sale,—Compressor, 1,000 to 1,500 cubic feet, 20 in. cylinder by 4 ft stroke, worked by cross-compound condensing engine, cylinders 15 and 27J by 4 ft. stroke; makers, Holman. ' Immediate delivery. A. UNDERWOOD, 3, Queen-street, E.C. For Sale.—Air-receiver, 20 by 5, for 100 lb. pressure. A. UNDERWOOD, 3, Queen-street, E.C. For Sale.—Winding Engine, 14 in, cylinders, 24 stroke, 6 ft. drum, 2 ft. wide, and capstan. A. UNDERWOOD, 3, Queen-street, E.C. For Sale.—Compressor, 750 cubic ft. straight line, 18 in. steam cylinder, 18 in. air, 30 in. stroke; by Holman. Immediate delivery. A. UNDERWOOD, 3, Queen-street, E.C. For Sale.—Boiler, 28 by 7, Lancashire, reinsure 150 lb. steam; also self-contained COMPOUND ENGINE, 13 by 23 by 24; by Davy Paxm in Immediate delivery. A. UNDERWOOD, 3, Queen-street, E.C. VW anted.—24 ft. by 7 ft. Lancashire V V BOILER, 100 to 120 lb.: also 22 by 7, for 100 lb., or nearest. A. UNDERWOOD 3, Queen-street, E.C. A. UNDERWOOD, 3, Queen-street, E.C. VWanted.—Boiler Tanks, or old Boilers V V for making into tanks A. UNDERWOOD, 3, Queen-street, E.C. For Sale.—126-kw. Steam Generating SE F, 220 volts, 6-pole. by Mather & Platt. A. UNDERWOOD, 3, Queen-street, E.C. VW anted.—Colliery Locomotive, 12 to 14. . t I —Apply, Box 6693, Colliery Guardian Office, 30 & 31, Furnival- street, Holborn, London, E.C. Tffie Colliery Ready Reckoner and Wages JL CALCULATOR. By JAMES IRELAND. “ Will be the means of preventing many disputes between pay clerks and colliers.”—Mining Journal. Colliery Guardian Office. 30 & 31, Furnival-street, Holborn, London, E.C. C’oth limp, price 1«. 6d.; post free, 1#. Id. fndian Mines Act, 1901, with a Digest of the Act, a reprint of the Act with explanatory notes,an appendix con- taining forms, a model code of Special Rules, &c., by W. H. Pickering, Chief Inspector of Mines in India, and W. Graham, Barrister-at-Law.— Price 10s. 4d. post free from Colliery Guardian Office, 30 & 31. Furnival-st, Holborn, London. E.C. ‘ TyfAPS of tlie British Coalfields. AwA j scotiand. 2. North of England. 3. South Wales. 4. North Midlands. 5. South Midlands. Sheet, 4s. each; Mounted on Cloth on Rollers, or in Case. 6s. each.—THE COLLIERY GUARDIAN CO. LTD. 30 * 31 Furnival-street, Holborn. London. E.C.