1122 THE COLLIERY GUARDIAN. November 29, 1918. Sections of our Patent Roller Conveyor. Our Patent Roller Jigging Conveyors are unequalled for efficiency, construction, durability and increasing output. It is the best labour-saving I plant introduced into a mine. No. 4 Conveyor will deal with 500 tons per shift. '0 PATENT COMPRESSED AIR-DRIVEN MOTOR. Made in sizes to suit all requirements. MOTOR ARRANGED ALONGSIDE CONVEYOR. Telegrams: “Conveyor, Sheffield.