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PROFESSOR B. G. NEAL (Associate-Member) said the authors had successfully extended the application of the well known method of plastic design to a range of latticed portal frames. However, in general, the plastic methods should not be used for such structures
unless certain conditions were fulfilled; he drew attention to those conditions and discussed how they were met in these particular frames.
Rhokana Corporation Limited owns the Nkana Mine in Northern Rhodesia, and is a member of the Anglo American Corporation of South Africa Limited group. As well as mining copper, the Rhokana Corporation operates a Smelter for the production of copper from its own concentrates and those of other mines in the group.
Robert G. Allaway
A Channel Link-the words have stimulated controversy, inspired ideals and technical ideas for 150 years-is at last within the realms of practical, economic and political possibility. Islanders though we are, and will remain, there can be no gain saying the diminution of the world brought about by high speed transport, advanced economic theory and the hydrogen bomb. Whilst we have treasured the twenty miles of geological discontinuity between us and the rest of Europe, and it has served us well on more than
one occasion, it must be accepted that to ' go it alone ' in the present age is a policy fraught with economic danger.
A. R. Flint