128 THE COLLIERY GUARDIAN. July 19, 1918. CONTENTS. Editorial Articles:— Page The Science of Coal Washing................. 129 The Southport Conference .................. 129 Articles :— The Future Aspect of Mine Surveying......... 121 Coal Exports in June ....................... 122 The Dombrova Coal Fields ................... 122 Coal Conservation in the Midlands .......... 123 New American Washery ....................... 123 The Thermal Decomposition of Coal and its Carbonisation Products................... 124 Miners* Conference.......................... 124 Notes on Sand-Filling in Mines.............. 125 The American Coal Trade .................... 125 Measuring Air and Gases with the Pitot Tube ... 126 Checking Loss in Flue Gases ................ 126 Carbocoal................................... 127 South Wales Mining Timber Trade ............ 133 The Southport Conference ................... 133 Obituary ................................. 134 Mining Industry and Military Service ....... 134 Coal Mining in Queensland................... 134 Rotary Underground Tipples ................. 135 Mean Magnetic Declination................... 136 Labour and Wages ........................... 136 Open Contracts ............................. 138 The Freight Market ......................... 138 Government Publications..................... 138 Publications Eeceived ...................... 138 Abstracts of Patent Specifications Eecently Acptd. 138 New Patents Connected' with the Coal and Iron Trades ................................ 140 Letters to the Editors :— Earthing Electrical Services in Mines....... 136 The Coal and Iron Trades ...................130—133 The London Coal Trade ...................... 133 The By-Products Trade ..................... 133 The Tin-plate Trade......................... 133 Parliamentary Intelligence.................... 134 Notes from the Coal Fields.................... 135 Law Intelligence ............................ . 136 Coal, Iron and Engineering Companies............ 138 Miscellanea:— Sanitary Precautions at the Jharia Coal Fields— Checking Up Slackers .................... 122 Coal on the Ehone—Imports of Pit Props—The Iron and Steel Trades Confederation...... 125 Briquetting Coal and Coke Dust—Partnerships Dissolved—Italian Lignite Production...... 126' Welsh Fuel Controller — Patents in Enemy Countries—Colliery Enginemen’s Wages..... 127 The Lanarkshire Colliery Disaster—University of Birmingham School of Mining—Lord Ehondda’s Will ............................ 132 Offence under the Coal Distribution Order... 133 Education Grant to Wigan Mining College..... 134 Bradford Coal Merchants* and Consumers’ Asso- ciation ................................... 136 Imports and Exports of Mining Machinery..... 138 Coal for Dredgers .......................... 140 Offices for ADVERTISEMENTS and PUBLICATION: 30 and 31, Furnival Street, Holborn, London, E.C. 4. Telegraphic Address—“Colliery Guardian, Fleet, London.** Telephone—1354 Holborn. Established 1866. PATENTS, DESIGNS, and TRADE MARKS. IT ARRIS AND MILLS, Chartered Patent Agents, ' 34 and 35, HIGH HOLBORN, LONDON, W.C. 1. Telegraphic Address—“ Privilege, London.” Tel. No.—Holborn 27c 5. “PATENTS. Advice Free. kXSw. 1 New Inventions, Designs, Trade Marks, carefully and promptly protected at low INCLUSIVE FEES. THE CONSULTING PATENT AGENCY (1880), 253, Gray’s Inn Road, London, W.C. 1. D. Llewellin Evans 0^ PROPRIETOR OF THE Cardiff Brattice Cloth Company, 120, BUTE ST., CARDIFF. AGENT FOR ITobers Explosives, AIO DI n E 6 JOH N BAKER & SON, MBBB I I r F IRON AND STEEL WORKER'S. OIBB a II feW Thompson St., BILSTON TUB CORNER PLATES BUCKETS and BASKETS THE 1SCA FOUNDRY COMPANY LTD., RAILWAY PLANT f GENERAL ENGINEERS, Switches, Crossings,Turntables, Water Cranes, Girders,Bridges, Roofs, Pipes, Pumps, Wagons, Tanks, Engines, Boilers, Cranes. Works: NEWPORT, MON. London Office—53, Victoria Street, S.W. 1. V E N TI LA T ING~F'ANS AND ENGINES. See Advertisement appearing on front Cover of alternate weeks. THE WADDLE PATENT FAN AND ENGINEERING CO. LTD., Llanmore Works, Llanelly. T>r\T)17TT/