392 THE COLLIERY GUARDIAN August 23, 1918. CONTENTS. Editorial Articles :— Page Coal Conservation: Final Report ............ 393 From War to Work ........................... 393 Articles :— Coal Conservation Committee................. 385 The Power Factor............................ 388 Explosives in Coal Mines.................... 389 Mining Employment Statistics ............... 389 Scottish Mine Workers* Conference .......... 389 Deep Borings for Coal .................... 390 Coal Exports in July........................ 390 Miners* Federation Conference .............. 390 Coal Production in British Columbia during 1917 391 Mining Industry and Military Service ....... 397 South Wales Mining Timber Trade ............ 397 Analysis of Air from a Mine Fire ........... 397 Liability for Extraordinary Traffic....... 398 Mean Magnetic Declination................... 401 Labour and Wages ........................... 401 The American Coal Trade .................... 402 The Freight Market ......................... 402 Open Contracts ............................. 402 Obituary ................................... 402 Abstracts of Patent Specifications Recently Acptd. 402 New Patents Connected with the Coal and Iron Trades ................................... 404 Government Publications..................... 404 Publications Received ...................... 404 The Coal and Iron Trades ....................394—397 The London Coal Trade ................... 396 The Tin-plate Trade......................... 396 The By-Products Trade .................... 397 Notes from the Coal Fields..................... 398 Coal, Iron and Engineering Companies............ 402 Miscellanea :— Bradford Coal Trade Association—British Potash Industry ................................. 390 Lockets Merthyr Collieries Company Limited— Cost of Coal Control Administration....... 391 Coal Production, January-June—Prime Minister and Importance of Saving Coal—Ironstone Area Tank Week................................... 394 Yorkshire Coal Strike Ended................. 396 Imports of Pit Props—Discharged Soldiers as Works Chemists — Empire Oil Resources — American Peat Industry—Italy’s Coal Shortage 397 Cleveland Ironworkers* Wages—Minnie Pit Disaster—Coal Rationing in the United States —Exports and Imports of Mining Machinery... 398 Partnerships Dissolved....................... 401 Conversion of Wasteful Grates—The Industrial Reconstruction Council — Mine Managers* Examinations ............................... 404 Offices for ADVERTISEMENTS and PUBLICATION: 30 and 31, 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 , 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. SUBSCRIPTIONS. The Colliery Guardian, published at 2.30 p.m. on Friday, can be supplied direct from the Publishing Offices, post free for twelve months, at the following rates :— United Kingdom ... ... 28/6 (26/- in advance). Canada ................ 30/6 (27/6 do. ). Foreign and Colonial ... 33/- (30/- do. ). When foreign subscriptions are sent by Money Orders, payable through the Post Office, advice should be sent to, the Publishers. 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 2763. Hines report, 1917!!! WE regret a large number of profit- and coal-wasting CAGE SMASHES in districts where the competency and profitable nature of the HANLEY CAGE ARRESTERS is fully acknowledged. WE would ask shareholders to remember that it is unnecessaiy for their profits to be thrown to the sump, besides LOSS OF COAL. A.R.S.M., M.Imrt.M.M. Lecturer in Coal Mining and 1 tjuLSE B Sc Surveying: J ’ ’ ’ L Wo?? ReSCUe } A- H- CLARK« B.Sc. THE SESSION COMMENCES ON OCTOBER 1st, 1918. The School of Mining meets the require- ments of those who intend to become Practising and Consultative Mining Engineers; Petroleum Technologists; Colliery Managers; Managers of Metal Mines; Teachers of Mining; Mine Surveyors; Land and Estate Agents; Land Owners; Owners of Collieries; and those generally interested in Mines and Quarries. The Degree Course includes instruction in Mathematics, Physics, Chemistry, Geology and Mineralogy, Mechanical Engineering, Electrical Engineering, Civil Engineering, Mining (Coal, Petroleum and Metal), and Metallurgy, Assaying, and Petroleum Refining. In connexion with the Mining Classes there will be frequent visits of inspection to mines in the neighbourhood of Birmingham,-and a SUMMER MINING SCHOOL will also be held in the long vacation in some mining district, either at home or abroad. The Mining Courses are so arranged as to provide for— Degree Course ........... 3 years. Diploma Course .................. 3 years. Occasional Mining Students ...... A complete course in 1 year. A complete Course of PETROLEUM MINING ENGINEERING is given in the University. The course of study extends over three years, and leads to the Degree of B.Sc. Full particulars may be obtained from the SECRETARY of the University. "T7or Sale, two 18 in. gauge Saddle Tank T LOCOMOTIVES, by Manning Wardle, 140 lb. pressure, 6 in. cylinders, copper fireboxes and tubes; new boilers in 1914 ana 1912. JOHN F. WAKE, Engineer, Darlington.