February 2, 1917. THE COLLIERY GUARDIAN. 219 COMPARE Working Parts of JEFFREY COAL CUTTERS With other Well-known Machines. •04 HUGH WOOD & CO. LTD., Newcastie-on-Tyne. LONDON : 65, Fenchurch Street, E.C. CARDIFF : 102, St. Mary Street. MANCHESTER : The Hive Works, Trafford Park. STEAM, MOTOR, BELT, OR ROPE=DRIVEN AIR & GAS COMPRESSORS From 50 to 15,000 cubic feet FOR COLLIERIES, MINES, Etc. ADVANTAGES'- SIMPLICITY. RELIABILITY. SELF-LUBRICATION SMALL FLOOR SPACE. One of Two 1,400 c.f. Air Compressors, in De Beers Mines S.A. ADVANTAGES DURABILITY HIGH EFFICIENCY. BEST WORKMANSHIP. MINIMUM MAINTENANCE BELLISS & MORCOM LIMITED Telegrams: “BELLISS, BIRMINGHAM.” BIRMINGHAM London Office: 8, VICTORIA STREET, S.W.