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Study of distribution and arrangement of steel in secondary reinforcement necessitated by shearing forces; author advocates policy of following with steel as closely as practicable tension lines of principal stress; by proceeding on these lines he has found it possible to reduce very materially quantity of steel which has hitherto been considered necessary in previous official plans for bowstring girders. (see also translation in Engineering, vol. 131, no. 3402, Mar. 27, 1931, pp. 409-410, 8 figs.)