veyors, lightweight truss sections are used that permit longer spans between supporting legs, and economical structural cost. A decking is provided to allow retum run of the belt which also lends lateral rigidity to the structure. For long centre conveyors, sidewalk ways The structures are often covered by tin are provided for inspection and adjustment to i plate at the top and sides to protect the materials being conveyed under the sky outside the plant. Fig. 6. 1.11 shows photographs of two long centre conveyors with their covered struc- tures, side walks etc.