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From Mr. D. L. LITTLE : As a visitor I should like to thank the Institution very much indeed for inviting me to hear Professor Baker give his paper.
Before dealing with the main substance of this subject there are certain factors which should be appreciated in order to obtain a true picture of the many variables which confront the structural engineer in work associated with the gas industry.
In this paper, Mr. Robson considers the effect on bending moments when the change of moment of inertia along a continuous reinforced concrete beam is taken into account. Changes are assumed to occur where the bending moment changes sign, and the calculations are based on the ratio of the moment of inertia of a plain concrete tee beam for sagging moment, and a rectangular beam for hogging moment.