March 22, 1918. THE COLLIERY GUARDIAN. 603 MADE WATERTIGHT BY OUR CEMENTATION PROCESS. SAVES COAL and LABOUR AND INCREASES OUTPUT BY DOING AWAY WITH PUMPING. (Cost of work recouped in a few months, and permanent results guaranteed.) Llay Hall Collieries, Wrexham, 2 wet shafts, linings cemented. Monk Bretton Colliery, Barnsley. Wrexham and Acton Collieries, Wrexham, 2 wet shafts, linings cemented. References: Wigan Coal and Iron Co. Ltd., Parsonage Colliery, Leigh, Lancs., 2 wet shafts, linings cemented. Risehow Colliery Co. Ltd., Flimby, 2 wet shafts linings being cemented. Pinxton Collieries Ltd., Pinxton Collieries, Alfreton, one wet shaft lining being cemented. SHAFT-SINKING By FREEZING or CEMENTATION. Llay Main Collieries, Wrexham, 2 shafts sunk by freezing. BY PRODUCT COKING PLANTS 440 OVENS AT PRESENT UNDER CONSTRUCTION IN ENGLAND. COAL WASHERS (“BRITISH BAUM” SYSTEM). 4 £ PLANTS WORKING OR UNDER CONSTRUCTION IN GREAT BRITAIN. BRITISH MANUFACTURE THROUGHOUT. SIMON-CARVES L“ -Sk, MANCHESTER Phone: i8200 City, Manchester (8 lines). Telegrams: “Simcar, Manchester.”