288 THE COLLIERY GUARDIAN. August 9, 1918. CONTENTS. Editorial Articles :— Page The Common Weal............................ 289 Fuel Rationing .......................... 289 Articles :— Notes on the Three-phase Induction Motor.... 281 Roof Conditions at the Lethbridge Colliery.. 284 Size of Grog in Fireclay Bodies............ 285 The Magnetic Meridian and the Orientation of Mine Surveys ............................ 285 Practical Examination for Mine Foremen .... 286 Petroleum Production Bill ................. 286 Book Notices ............................ 287 Mining Electrical Engineering ............. 287 South Wales Mining Timber Trade ........... 293 Bar Iron and Steel Prices ................. 293 Production of Oil from Cannel Coal ........ 293 The Isere-Ain Coal Field................... 294 Accidents from Explosives in 1917.......... 294 Mean Magnetic Declination................... 296 r Fuel Economy............................... 296 Labour and Wages .......................... 296 The American Coal Trade ................... 296 The Freight Market ........................ 293 Open Contracts ............................' 298 Obituary .................................. 298 Government Publications.................... 298 Publications Received ..................... 298 Abstracts of Patent Specifications Recently Acptd. 298 New Patents Connected with the Coal and Iron Trades .................................. 300 Reports of Meetings:— Midland Institute of Mining, Civil and Mechanical Engineers ................................. 283 The Coal and Iron Trades ...................290—293 The By-Products Trade ..................... 292 The Tin-plate Trade........................ 292 The London Coal Trade ....*............... 293 Current Science and Technology ............... 287 Parliamentary Intelligence..................... 294 Notes from the Coal Fields................... 295 Coal, Iron and Engineering Companies........... 298 Miscellanea :— Midland Iron Production—Prosecution Regarding Coal Prices ............................. 283 “ Fuller n Safety Lamps Approved—Spain’s Coal Crisia................................. 286 Threatened Stoppage of Yorkshire Pits—London's Coal Supply—Qualifications of Surveyors . 292 Mining Institute of Scotland—Army Gas Masks and Rescue Work—Northumberland Miners’ Decisions ................................. 293 Ammonite No. 5 as a Permitted Explosive—Road and Canal Transport....................... 294 Coal Shortage in Ireland—Internal Transport ... 295 New Ovens for Messrs. Newton, Chambers and Company Limited ................... ..... 298 Canadian Coal Supply—Miners' Deputation to Coal Controller ......................... 300 ADVERTISEMENTS. Offices for ADVERTISEMENTS and PUBLICATION! 30 and 31 f Furnival Street, Holborn, London, E.C. 4. Telegraphic Address—“Colliery Guardian, Fleet, London.” Telephone—1354 Holborn. CONTRACT ADVERTISEMENTS : Prices for SPECIAL POSITIONS on application. Prices for ORDINARY POSITIONS:— Single Column (3 inches wide) : For 52 insertions 3s. 9d. "1 per insertion for each „ 26 „ 4s. 6d. > . , . , ” 13 ” 5s. 3d. 5 meh in depth. Double Column (6 inches wide), double the above rates. Three Columns (9 inches wide), three times the above rates. Established 1866. PATENTS, DESIGNS, and TRADE MARKS. Harris and mills, Chartered Patent Agents, 34 and 35, HIGH HOLBORN, LONDON, W.C. 1. Telegraphic Address—“ Privilege, London.” Tel. No.—Holborn 2763. Also “ BITSOL ” QUICK TAR BLACKS W. W. Hill, Son & Wallace Ltd., Elton St., Broughton Bridge, MANCHESTER. ---- ESTABLISHED 1840. - ASSOCIATION OF PRIVATE OWNERS OF RAILWAY ROLLING STOCK. Formed in 1891 for the Protection of the Bights and Interests of Private Owners. Applications for particulars and terms of membership may be sent to the SECRETARY, Clarence Chambers, Gloucester. The Oldest Diamond Drill Company. Established 1872, PORING fob JVflNEBALS. SPEED AND CERTAINTY. CYLINDRICAL “CORES.” THE AQUEOUS WORKS and DIAMOND ROCK-BORING CO. LTD Cuildfo.id St., York 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 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. Briquette Machinery Ltd., Charmouth Street, LEEDS. Machinery for Briquetting Peat, Lignite, Coke, Coal, Iron, Copper, Nickel, Cement; Also Sawdust, Waste Cereals, Offals, Sewage. PATENT COAL DRIER. YEADONS’ LATEST PATENTED BRIQUETTE MACHINERY, For Coal, Coke, Iron and other Ores. YEADON, SON & CO., Engineers, LEEDS, Have a World-wide Reputation, and 40 Years’ Experience. They have supplied MORE BRIQUETTE PLANTS than any other firm in this country. A RM YT AGE & JONES Ltd., SHEAF STREET, SHEFFIELD. RAILS. WAGONS. CRANES. (For all purposes). (Coal & Ballast). (Loco & Derrick). Boiler Tanks. Points and Crossings. Sleepers. Buffer Stops. Buyers of all kinds Steel and Iron Scrap. “VENTWAL” CANVAS TUBES FOR MINE VENTILATION. No skilled labour required. Made in London. SIEVEKING, PODMORE & CO., 57, Gracechurch St., E.C. 3 THE Corlett Electrical Engineering Co. Ld. T’phone— VTTO A W « T’gram- 63 Wigan. « “Corlett, Wigan.” Contracts Dept. - Ref. C.D. Manf8 & Repairs Dept. - Ref. W.D. Stores Dept. - Ref. S.D. q / Cables and Wires, / Metal & Carbon Filament Lamps, / Batteries and Accessories. —“TREFOR”— BORING AND SINKING CO., Contractors for Deep Borings and Pit Sinkings a/f over tho World. ----. ------ Bank Chambers, 329, High Holborn, LONDON, W.C. Geo. N. Dixon & Co., 43, Cattle Street, Liverpool, Auctioneers and Valuers, COLLIERIES, Brickworks & Mining Plant. “COMRITE JOINTINGS, SHEETINGS & PACKINGS, «c. The BEST for Steam, Hydraulic, and Highest Pressures. UfiQF Delivery, Suction (Plain or Armoured), nUwt. Seamless Woven Canvas. VALVES & WASHERS, &o. BALATA BELTING. ASBESTOS GOODS of all descriptions. Prompt Attention. Deliveries FROM STOCK. ----- Direct Service per Gr.W. Ry. - ALEXR COMRIE & SONS 23/27, Bridge St., SOUTHAMPTON. Tel. Add.—“ Comrite, Southampton.” Tel. No.—1695 Southampton. AERIAL ROPEWAYS ANY SYSTEM. The British Ropeway Engineering Co. Ltd., 7, MINCING LANE, LONDON, E.C. 3. Tele—CENTRAL 1 1250. MORE COAL e£tly About 2,000,000 TONS OF COAL could be added to Annual Output by the general adoption of Hanley’s CAGE ARRESTERS and Detach HOOKS, Rope, Guide, and centre-guide CAPPLES, and BELT RIGS for Shaft, Building and Tarstill workers, etc. SAFETY is EXTRA. These appliances save Lives, Profits, Wages, and effect Output in conditions untouched by any other appliances. BELT RIGS are sent free for inspection. These appliances cost 1 per cent, of their Profit Value to buyers ; or may be supplied FREE on USAGE-Profit Sharing Terms, From A. HANLEY, Thirlmere, Sheffield. Brattice Cloth. — Gentleman Wanted with influence amongst colliery managers and proprietors, to sell BRATTICE CLOTH on good commission only.—Address, FAIRCLOUGH & SONS, Bank-lane, Clayton, near Manchester. Wanted at once, a thoroughly expe- rienced and practical ENGINEWRIGHT, 'west Yorkshire.— Apply, statingage, qualifications, and wages required, Box 7102, Colliery Guardian Office, 30 & 31, Fumival-street, Holborn, London, E.C. 4. /Colliery Manager, 37, Desires Change. First-class practical experience • electrical and compressed air coal cutting, conveyors, pumping and haulage. Had charge of sinking, and accustomed to deal with large bodies of men and heavy outputs.—Box 7115, Colliery Guardian Office, 30 & 31, Fumival-street, Holborn, London, E.C. 4. TXT’anted, Colliery Enginewright. Good y V wages offered for suitable man. State age and experience.— Apply, BARBER, WALKER & COMPANT, Eastwood Collieries, nr. Nottingham. Manager Wanted, for Steam Coal Colliery in Monmouthshire.—Applications, stating age, qualifica- tions and experience, also salary asked, to Box 7119, Colliery Guardian Office, 30 & 31, Fumival-street, Holborn, London, E.C. 4. Wanted, for Colliery in Midlands, UNDERGROUND SURVEYOR (ineligible), who will make himself generally useful. State salary, also give age and references.—Apply, Box 7122, Colliery Guardian Office, 30 & 31, Fumival-street, Holborn, London, E.C. 4. anted, for small Developing Colliery in South Staffordshire, WORKING MECHANIC, ineligible, to take full charge of surface arrangements.—Apply, stating age, experience, and wages required, and when at liberty, to Box 7121, Colliery Guardian Office, 30 & 31, Fumival-street, Holborn, London, E.C. 4. OLD COBBIBBY SITES. anted to Purchase Old Colliery Sites for planting, or otherwise improving. Address in confidence Box 7114, Colliery Guardian Office, 30 & 31 Furnival-street, Holborn, London, E.C. 4. Pit Props for Sale, in Kent and Sussex, in 4-ton truckloads, 2 in., 2| in., 3 in. and 3J in. tops, in Larch, Fir, etc. Prices on application.—Box 7120, Colliery Guardian Office, 30 & 31, Fumival-street, Holborn, London, E.C. 4. SOUTH WALES AND MONMOUTHSHIRE SCHOOL OF MINES. TREFOREST, GLAMORGAN. Session 1918-19 commences on Monday, 7th October, 1918. Courses of Full Time Instruction in— (1) Mining Engineering, (2) Mechanical and Electrical Engineering, (3) Chemical Engineering, in any one of which students may be apprenticed without premium to one of the thirty colliery companies connected with the School. For particulars of admission, Fees, Courses, Scholarships and Apprenticeships, apply to the Principal, Professor G. KNOX.