The British Materials Handling Board, following their long-term promotion of bulk storage and handling interests, perceived the need to make available a practical guide to the design, selection, and application of screw feeders. the author, Lyn Bates, as an international renowned expert in this field, was commissioned to prepare this user Guide. As Managing Director of Ajax Equipment Limited, a company that specializes in screw-type equipment for solids handling, he enjoys a 'hands-on' attitude to powder handling problems. He has introduced various design innovations and patents in the field and designed various instruments for measuring flow-related powder properties. As a member and past chairman of the Institution of Mechanical Engineers Bulk Materials Handling Committee, he produced a 'Guide to the Specification of Bulk Solids for Storage and Handling Applications'. An active member of the European Federation of chemical Engineers Working Party on the Mechanics of Particulate Solids, and sitting on various BSI and other technical committees, he is dedicated to promoting education in this specialized section of engineering. Lyn Bates has written many technical papers and publications on aspects of bulk solids handling. This book complements related publications by the BMHB, which include the author's earlier book 'A User Guide to Segregation', as well as 'User Gide to Particle Attrition in Mechanical Handling Equipment', prepared by a working party chaired by Lyn Bates.