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FOLLOWING Coulomb, a great number of papers appeared on Retaining Wall Design, until by 1930 the theoretical basis of earth pressure against stiff walls due to failing soil had largely been established. In contrast, little was known about the values of the soil constants to be used in the theory, or the influence of the type and degree of wall movement on the distribution of pressure on the structure. In consequence, theories were mainly confined to the classroom, while empirical rules or semi-empirical use of simple theorics served the practical basis of design. P.W. Rowe
A BATTENED strut is built up from two or more main members*, which carry the axial load, and which are held at a fixed distance by cross-members. F. Koenigsberger
Mr Philip Reece (F): It has been mentioned already that the trussed rafter industry is now 15 years old, and I think it is by no means too soon for Mr Ransom to peer into the future and see what possible dangers are awaiting the use of the trussed rafter on a big scale. There will be, and are, plenty of legitimate criticisms. After 15 years, it is unlikely that such a revolution as we made in the building industry would go by without leaving some traces somewhere. But let us not lose sight of what the trussed rafter has achieved for us.