July 9, 1915. ___________________________________________________ THE COLLIERY GUARDIAN. 89 ______ Mining BOOKS At Tremendous Reductions ! New Books at 25 per cent. Discount! Books on Mining, Technical and all other Sub- jects. Sent on Approval. State Wants. Send for Lists. Books Purchased. W. & G. FOYLE, 121423, Charing Cross Road, London, W.C. ________________________________________________ OXYGEN. The BRITISH OXYGEN Co. Ld. The oldest and most extensive Oxygen producing and distributing business in the World. Factories in all industrial Centres equipped with modern plants producing Oxygen of unrivalled quality for use with RESCUE APPARATUS. ADDRESSES OF THE COMPANY’S WORKS: LONDON ______ Elverton St., Westminster, S.W. ,, ______ Tunnel Avenue, East Greenwich. BIRMINGHAM ... Saltley Works. [S.E. WOLVERHAMPTON Lower Walsall Street. CARDIFF ______ East Moors. MANCHESTER___ Great Marlborough Street. BIRKENHEAD___ Bromborough Port. SHEFFIELD ___ Celtic Works, Savile Street. NEWCASTLE-ON- TYNE ______ Walker Gate. GLASGOW_______Rosehill Works, Polmadie. SYDNEY ______ N.S.W. rWOODITE The best material for GAUGE GLASS RINGS in all sizes and sections For Valves, Joint Rings, Pump Cups, Ram Rings, Packing Rings. Price Liat and full particulars on application to— WOODITE CO., Mitcham Common, Surrey. ______________________________________________________ < ‘J ELECTRICAL CABLE MAKERS & ENGINEERS. REGD. TRADE MARK. Works: Prescot, Helsby, & Liverpool. SEE LAME ADVERTISEMENT EVERY FOURTH WEEK. British Manufacture Best Quality at Lowest Prices Every description either separate or in cases. SPECIAL 12 in. CARDBOARD PROTRACTOR, reading to i°, at 2«. Gd., postage Gd. ILLUSTRATED CATALOGUE ON APPLICATION. WU UADI INC Mathematical Drawing and Surveying . Fl. FlMnuillWj Instrument Manufacturer, 47, Finsbury Pavement, London, E.C. Established 1851. Factory—HACKNEY, E. rphe 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.O. Cloth limp, price If. 6d.; poet free, If. Id. THE SOUTH WALES COALFIELD. PART II. By Henry K. Jordan, F G.S. (Past Presi .ent and first Gold Medallist of the South Wales Institute of Engineers). This Paper, which deals with the western part of the Coalfield, has just been published by the South Wales Institute of Engineers. It consists of 81 pages oi printed matter with sections and diagrams. The large drawings are issued separately and comprise 1. A Horizontal Section across the anthracite region of Llandybie and Pant-y ffynnon, and via the Dulais Valley to the sea at Swansea. It is drawn to a scale of six inches to one mile, is 8 ft. in length, mounted on linen, and geologically coloured. 2. Comparative Sections of the Lower Measures in the following areas (A) Neath Valley. (E) Ammanford. (B) Swansea Valley. (F) Loughor Valley. (C) Brynamman District. (G) Gwendraeth District. CD) Amman Valley. (H) Gwendraeth District. These are drawn on one sheet, about 35 by 30 in., mounted on linen, to a scale of 200 ft. to 1 in. 3. A Map of Swansea District, on a scale of 6 in. to one mile, showing the outcrops of the coal seams. A limited number of the above are for sale, and may be obtained from The Secretary, The South Wales Institute of Engineers, CARDIFF. Price £1 is., Postage Extra. ** The South Wales Coalfield,” Part I., by Mr. H. K. Jordan, published in 1908, price £2 2s , dealt with the eastern half of the Coalfield, and may be obtained from the Secretary. ^Illllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllliw Elliptic Full-way Cock costs no more than an elongated- way cock, and is equal in service to a round-way full-bore cock. W. H. WILLCOX & CO. LTD., 32 to 38, Southwark Street, London. CLEAR-FLOW BORE.” Write TO-DAY for detailed particulars and prices. _______ 1111111111 llllllllllllllllllllllllllllllllllilllllllllllllllllllllllllllllllll 11 r __________________________ Semet-Solvay Coke Ovens SECTION OF OVEN Strongest in Design. Separate sets of flues to each oven. Very low Maintenance Cost. ________________________________________ “DIRECT” AMMONIA RECOVERY PLANT, giving increased yield of Sulphate, with less Labour, and a saving in Steam consumption. SHOWING SOLID CONSTRUCTION. THE COKE OVEN CONSTRUCTION CO. L! Howard Chambers, 155, Norfolk Street, SHEFFIELD.