Mr. A.R. Kjar (Research Student, University of Tasmania) writes: ' In part 2 the authors have presented results of tests on I-beams and concrete columns lifted by cables. A straight Southwell plot on rotation against load was used in an effort to correlate the behaviour of the physical and mathematical models, in the hope of justifying the mathematical model. '
A numerical procedure based on the successive approximate method is used for the determination of elastic buckling loads of columns. For the two cases, (l) columns hinged at ends, and having a symmetrical variation of moment of inertia (if section varies); and (2) columns with constant or varying section, fixed at one end and free at the other; it is shown that the major calculation involved in the method, which is the determination of deflections, can be easily and mechanically done. Thus the determination of elastic critical load for such columns becomes very easy and is illustrated in four worked examples. Prakash Desayi
Two sorts of figures and tables are referred to in this text: those appearing in the original paper and those produced in the course of the discussion. The latter are distinguished by the prefix D. Mr. R.B. Hill: 'Mr. Akroyd has bravely rejected the "cabinet protection" he might have claimed as he states in the penultimate paragraph of his acknowledgements that he was only the Chairman of his panel, adding that any merit in the paper was the result of the efforts of the Panel, and any faults were the responsibility of the author. I congratulate the Panel; I wish I could extend the same felicitation to the author!'