22 ________________________________________________________________________________________________________________ THE COLLIERY GUARDIAN July 7, 1916. CONTENTS. Editorial Article :— The Half-year’s Coal Trade .................,................. Articles :— Mine Ventilation Stoppings ........................... On the Liberation of Gas in Mines.............. Prevention of Diseases Among Miners.......... Electrical Inspection in Factories .............. Coal Export Licences.......................... The German Coal and Iron Trades ............... Mining Industry and Military Service .......... Certified Occupations ........................ Horse v. Compressed Air Haulage .............. The Lancaster Piston Throttle Valve .......... The Coal Mining Industry of Poland............ The American Coal Trade ..................... The Italian Coal Trade and the War............ Coke as a Boiler Fuel ........................ The Use of Iron for Transmission Lines ........ Handling Ashes at an Electric Power Station ... Labour and Wages............................ The Freight Market .......................... Open Contracts ............................. Abstracts of Patent Specifications Recently Accepted................................... . New Patents Connected with the Coal and Iron Trades ............................... Government Publications .......... Publications Received ............ Parliamentary Intelligence ........... Current Science and Technology........__ Indian and Colonial Notes ............ Notes from the Coal Fields ........... Coal, Iron and Engineering Companies Stock and Share List.................. The Coal and Iron Trades............ PAGE 23 15 17 18 19 20 21 21 21 29 29 29 29 30 30 31 31 35 35 36 37 .. 38 .. 38 .. 38 .. 31 .. 20 .. 33 .. 32 .. 36 .. 34 .24—28 The Tin-plate Trade ......................... 28 The By-Products Trade ...................... 28 The London Coal Trade ...................... 28 Letters to the Editors Mining Surveyors’ Examinations, &c............ 29 Miscellanea :— Hull Coal Exports—Geological Work in Scotland 18 Australia’s Coal Embargo .................... 24 Coal Trade Benevolent Association — Scottish Holiday Stopped........................... 28 Grimsby Coal Exports—Summer Mining and Engineering School ........................ 29 Enemy Interests in Oil Companies............. 31 Exports to Archangel ........................ 35 Questions of “Permits ”—Immingham Coal Exports —Labour, Freights, and Commodity Prices ... 38 ____________________________________________________ ADVERTISEMENTS. Offices for ADVERTISEMENTS and PUBLICATION— 30 & 311 Furnival Street, Holborn, London, E.C. 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) : per insertion for each inch in depth. Double Column (6 inches wide), double the above rates. Three Columns (9 inches wide), three times the above rates. for 52 insertions 2s. bd. „ 26 ,, 3s. Od. ,, 13 ,, 3s. 6d. ________ 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. (A Classified List appears on page 40.) ___________________________________________ 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, payable in advance :— For the United Kingdom________ £1 3 6 For Foreign Countries and Colonies £1 7 6’ When foreign subscriptions are sent by Money Orders, payable through the Post Office, advice should be sent to the Publishers. ________ Offices for Advertisements and Publication :—30 and 31, Furnival Street, Holborn, London, E.C. Telegraphic Address, “Colliery Guardian, Fleet, London.” Telephone—1354 Holborn. ________________________________________________________ Established 1856. PATENTS, DESIGNS, and TRADE MARKS. IT ARRIS AND MILLS, * *- Chartered Patent Agents, 34 and 35, HIGH HOLBORN, LONDON, W.C. Telegraphic Address—“ Privilege, London.” Tel. No.—Holborn 2763. ___________________________________________ VENTILATING FANS AND ENGINES. See Advertisement appearing on front Cover of alternate weeks. THE WADDLE PATENT FAN AND ENGINEERING CO. LTD., Llanmore Works Llanelly VIVIANS BORING COMPANY ElOy?’' 83 Miles of Borings Complete!-.4 WORK GUARANTEED. JP _J»*YEAR5e _____________________________________ BORING fob MINERALS, &c Solid Specimens of the Strata obtained. Established 1888. Work guaranteed. J. S. DAVIDSON & SON, St. Bees, CUMBERLAND. ________ __________________________ INCREASE STEAM CAPACITY OF BOILERS. water HEATER-SOFTENERcombined Utilise Exhaust Steam or Gases. _____________ Write— The Lawrence Patent Water Softener, &c., Co. Ltd., PARLIAMENT MANSIONS, WESTMINSTER. ____________________________________ “CROWN” BOILER COVERINGS of Outstanding Superiority. 967, SAYING Intensest Heat cannot Impair. SUTCLIFFE BROS. STEEL Rails Roof Bars Pit Props Arches For COLLIERIES and WORKS. THQS W. WARD Ltd., Albion Works, SHEFFIELD. TRY US, -------- MARITIME COALING ADMINISTRATION _____________ Planning of Coaling Stations. Parliament Mansions, Victoria Street, Westminster, England. HEAD, WRIGHTSON AND CO. LTD., ------ FOR - COLLIERY PLANT. See Page Advertisement in next issue. _____________________________________________________________ IV anted, Colliery Manager with First- V v class certificate.—Apply, stating age, experience, and salary required, to GENERAL MANAGER, Denby Colliery, near Derby. anted for Colliery in India, 2 practical V V MINERS with good experience in dispillaring under broken roof, in fighting underground fires and in mechanical haulage; salary £300 per annum; one year’s engagement certain, free passage out and home.— Write, stating age and full particulars of qualifications and experience, to “ INDIA,” c/o Streets, 30, Uornhill, London, E.C. Viyanted, Surveyor for Colliery near V V Barnsley—Address, stating age, experience, and salary required, to Box 6455, Colliery Guardian Office, 30 &> 31, Furnival-street, Holborn, London, E.C. First-class Certificated Colliery Manager of exceptional practical experience and references is open to engage- ment after 25th in st. for war period or permanence.—Apply, “X. T. Z.,” Box 6445, Colliery Guardian Office, 30 & 31, Furnival-street, Holborn, London, E.C. COUNTY BOROUGH OF SALFORD. COAL, SEWAGE WORKS. Tenders required by 10 a.m., 12th July, 1916, for twelve months’ supply of coal—Full particulars from MANAGER, Sewage Works, Weaste, Salford. To Colliery Owners requiring temporary representation for period of the war; well known London firm will undertake duties for nominal expenses only.—Box 6372, Colliery Guardian Office, 30 & 31, Furnival-street, Holborn, London, E.C. Price 2s. "Useful alike to the Student and Practical Man.** /"Colliery Manager’s Catechism, containing Practical and Scientific Information for the use of Students. By W. FAIRLEY, F.G.S. The author conveys his information by means of more than 670 questions and answers, under the following chapter headings :— The Coal Minos Regulation Act, 1887 —Geology—Ventilation—Gases— Varieties of Coal and other Fuel—Steam, Boilers and Engines—Practical Mining—Mathematics—Land and Mine Surveying — Applied Mechanics- Statistics—Electricity—Miscellaneous Subjects — Appendix (Text of the Mines Regulation Act, 1887). THE COLLIERY GUARDIAN CO. LTD., 30 A 31, Furnival-street, Holborn, London, E.C. Geo, N. Dixon <£ Co,, 43, Cattle 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. CORRESPONDENCE INVITED. SALES conducted in all parts of the Kingdom. COAL, IRON & STEEL SHARES. WILLIAM CHAPMAN & COMPANY, Stockbrokers. (established since 1851). Cavendish Buildings, Wheeler Cate, NOTTINGHAM. Special Business in Coal, Iron and Steel Shares. Lists, reports, &c., will be forwarded regularly on application. _______________________________________________ SOUTH WALES AND MONMOUTHSHIRE SCHOOL OF MINES. TREFOREST, GLAMORGAN, AND CRUMLIN, MONMOUTHSHIRE. FOURTH SESSION COMMENCES 3rd OCTOBER, 1916. rpiie Entrance Examination in (1) Joint Diploma Mining Cours?, (2) Colliery Engineering Course, and (3) Chemical Engineering Course. will commence on Tuesday. 19th September, 1916. Candidates must forward their names not later than 15th September, 1916. For particulars of above Courses, Part-time Courses, and Apprenticeships, Apply to the PRINCIPAL., School of Mmes, Treforest, Glam. SOUTH WALES COALFIELD. To Let 2,000 acres of highly Bituminous COALS, 9 workable seams; estimated yield exceeds 100,000,000 tons.— For further particulars and terms, apply to G. E. GORDON, ME., Swansea. \V7 anted for cash in advance, 2,000 tons V V Midland Brights and Nuts, also 1,000 tons Steam Large and Steam Nuts ; also wanted on simple hire, 100 modern Coal Wagons.— DIRECT COALS LTD, Yeovil. VUanted, Turbine Pump, to deliver V V about 880 gallons per minute, against a head of 100 yards, com- plete with Motor and Switchgear, for 500 volts, 50 cycles, or 3,000 volts; must; be guaranteed in good condition and first class working order.—State full particulars, where seen, and price, Box 6456, Colliery Guardia* Office, 30 & 31, Furnival-street, Holborn, London, E.C. YUanted, Direct-driven Alternator with ▼ V Engines, by good maker, output 250 to 350 kw. at 3,000 volts, 50 cycles, with switchgear, &c., complete, boiler pressure 12G lb.; must be in good order and of modern construction.—State full particulars, price, and where seen, Box 6457, Colliery Guardian Office, 30 & 31, Furnival-street, Holborn, London, E.C. For Sale, 3,600 yards of D.C. Copper CABLES (armoured) in various lengths, with 7/16, 19/15, and 3/17 wires.—THOS. JENKINS & SON, Briton Ferry, Glam. \\Tanted, Belt Conveyor, about 12 in., V v 350 ft to 400 ft. centres.—Price and particulars to H. ARNOLD & SON, Contractors, Doncaster. For Sale, three Double Cameron Pumps, with 14in. rams, made by Frank Pearn & Co. Ltd.. Manchester; never used; to be cleared cheap.—Apply, THOS. BINDLEY, 5, Oak- avenue, Heaton Moor, Stockport. For Sale, four 2| in. and four 3|m. high speed No. 5 SHANK TWIST DRILLS ; one of each size never been in use, and the others have done very little work.—Apply, P. P. WHEEL- WRIGHT, Borough Electrical Engineer, Jubilee street, Blackburn. For Sale, one Craven Patent Cutting-off MACHINE, double geared, heavy construction, take bars up to 13in. diameter, two cutting off rests, with automatic feed, three-speed cone and special bush, to take 6J in. bars; in good working condition.—Apply, P. P. WHEELWRIGHT, Borough Electrical Engineer, Jubilee-st., Blackburn. PUMPS FOB SALE. Tangye Vertical Special Pump, 300 ft. series, cylinders 14in., pumpa 10 in., stroke 24in.; £75. Two Gwynne Vertical Compound Engines, coupled direct to Centrifugal Pumps 16in. delivery; fine condition ;\£150 each. Centrifugal Pumps, 5 6 and 8 in. outlets, at low prices. JOHN F. WAKE, DARLINGTON. QXCykw. Steam-driven Generating Set, AW consisting of 10-pole Compound Wound “ British-Schuckert ” Generator, 500/550 volts, d.c., 510 amps., 150 r.p m., direct coupled to Vertical Inverted Triple Expansion Engine, by J. & H. McLaren, complete with rope driven condenser, spare armature, and switchboard panel; compound windings of above may be removed or cut out easily and set run shunt at 440/490 volts ; this plant may he inspected at Swansea, must be loaded within 7 davs, and on this account will be sold at an extremely low price.— WESTERN ENGINEERING CO., Swansea. TXT’anted, 10 or 12-ton Railway Coal v V WAGONS.—State size, doors, age, and lowest price, to Box 6459, Colliery Gua<- dian Office, 30 & 31, Furnival-st.. Holborn, London, E.C. BLOWERS FOB SALE. NEW AND SECOND-HAND, AND EXHAUSTERS. Two Sets Horizontal Double Cylinder Blowing or Exhausting Engines, cylinders 18| in. by 16 in. stroke, suitable for electric drive; £150 each. Steam Turbo and Exhauster, Rateau system, capacity 15,000 ft. per min. Baker’s Pressure Blower, No. 13,12 in. outlet; £30. Root’s Blower, Engine driven, 10in. outlet, 3,000 ft. per minute; £60. Root’s Blower, Engine driven, 11 in. outlet, 4,000 ft. per minute; £75. “Sirocco” Fan, Ilin outlet, 12in. inlet, belt-driven, with pulley 10in. by 6in., double standard; £15. New “ Roots ” Blower, belt driven, 2 in. outlet; £4. ditto 2Jin. outlet; £10. ditto 2^ in. outlet; £12. JOHN F. WAKE, DARLINGTON. Dittj Ditto For Sale, four 3-ton Electric Loco. CRANES, by Smith, of Rodley, 4ft.8iin.gauge,immediate delivery. —A. UNDERWOOD, 3, Queen-strret, E.C. For Sale, Air Receivers, 20ft. by 3 ft. 6in., 120pressure; one Vertical. 8ft. by 3ft. 6in.—A. UNDERWOOD, 3, Queen-street, E.C. VX7"anted, 500/600 yards of 18in. to 24in. V v diameter VENTILATION PIPES, suitable for suspending in a sinking pit.—Apply, Box 6462, Colliery Guardian Office, 30 A 31, Furnival- street, Holborn, London, E.C.