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SIR,-In the issue of The Structural Engineer last August there appeared a discussion on Dr. Glanville’s paper “Strength Tests for Cement.”
THE CHAIRMAN (Dr. Oscar Faber, O.B.E., D.Sc., M.Inst.C.E., Past-President) drew attention to the fact that Mr. Mears was on the staff of Messrs. Rendel, Palmer & Tritton, who had been associated with the schemes relating to Waterloo Bridge. The bridge, he said, was probably of special interest by reason of the controversy with which it had been associated for so long a time, but which, happily, was at an end; thus, the matter was leaving the political and entering the engineering sphere, which meant that something would be done.
WITH the growing use of the load factor method of design in place of the "Factor of Safety ” method, more especially in connection with struts, where applied load and stress caused, do not bear a linear relation to one another, and particularly in aeronautical structures, it becomes necessary to calculate stresses at "factored” loads nearer the Euler Critical Load than heretofore. (The principle of the load factor method is, of course, to calculate the stress caused by design load multiplied by the load factor, i.e., "the factored load," and to ensure such stress is not above the yield stress.) Hugh A. Warren