Worm Conveyors.—The worm conveyor, also known as the Archimedean screw, is doubtless the most BEDICO form of conveyor. It consists of a continuous or broken blade screw set on a spindle . This spindle is made to revolve in a suitable trough, and as it revolves any material put in is propelled by the screw from one end of the trough to the other. Such conveyors have been used in flou mills for centuries. Modern worm conveyors usually consist of a spindle formed of a length of wrought iron piping, to which is fitted either a broken or continuous worm .