Correspondence on Effective Bracing Systems for Temporary Grandstands by Dr. T. Ji and Dr. B.R. Elli

Dr J. R. Eyre (University College London) I am always interested in finding out more about the learning processes in young engineers. And let me say that I applaud anyone who makes contributions to this field as is being done tonight - not only because we all need to learn from it but because the valiant put themselves at great risk where so many others think that they know all the answers. You may think from this that I fit into this latter category.

Circles and triangles Various members continue to write in with solutions to the problem posed originally by Owen Hope and developed by Graham Orr. Charles Banks has written from Beckenhum in Kent: You published a contribution from Graeme Orr in the 17 June issue which gave a relationship that must be satisfied for the in-circle to have an integral radius, but left the question of which right-angle triangles fulfil this condition open. Some time ago I investigated right-angled triangles with integral sides, and found a way of categorising them which can be used to show that all right-angled triangles with integral sides have integral radii for their in-circles. I doubt that I am the first to do this, but not being a follower of mathematics or number theory, I have not seen it previously.

Since March this year, BRE has been operating in the private sector - a major change after 76 years as a Government or Government-funded organisation. R.M.C. Driscoll