April 19, 1918. THE COLLIERY GUARDIAN. 785 By Tests The Best increase IN EVAPORATION “SINGLE HOOD” “PERFECTA” BOILER CIRCULATOR Ltd., 39, Victoria Street, LONDON, S.W. 1. a MAKERS OF ALL CLASSES OF . . . Telegrams : “ Smedley, Ironville.” A' ' Telephone: No. 67, 68, & 69, Ripley. Designed to comply with the Coal Mines Act, 1911, and to facilitate loading. Can be Readily Fixed to Existing Trams. Girders Hydraulically Cold Straightened. IP W ■ W W ---: PIT TRAM AND WAGON WORKS :- Codnor Park, ALFRETON I ■ ■ ■ ■ I I I OPEN. ‘ CLOSED. COLLIERY OWNERS and MANAGERS are invited to send for particulars of