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It is often found in the design of bridges, and sometimes in the design of floor slabs and beams for buildings, that the spans are of uniform section and symmetrically placed. C. Lawrence
Mr. C. B. Stone (Vice-president) said it was a common failing of consultants not to admit that their Structures leaked; however, he himself did not know of any case of leakage due to shutter ties. Mr. Jackson had shown there was a weakness but Mr. Stone thought that, if there had been a low water/cement ratio and thorough compaction by vibration, the cavity would not have formed.
Mr. D. G. ,Alcock (Associate-Member) writes:- ‘The authors claim to present a unified approach for the determination of the degrees of freedom or indeterminacy of plane and space frames. In fact the claim is rather ambitious as it can only yield the degree of indeterminacy of a structure which is already known to be stable.'