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SiR,-In the January (1930) number of our Journal Mr. G. J. Voce, who has written a very interesting paper, has unfortunately missed the essential matter underlying the theory of uniformly varying pressure.
MODERN tendencies in building construction are in very many instances governed by a consideration that did not usually obtain in the past. Except for the great harbour constructions, dams, and kindred undertakings, buildings of the present day are not often erected, as were the pyramids, and temples of the distant past, and the castles, cathedrals and palaces of the Middle Ages, with the intention that they should endure for ever. We are engaged constantly in demolishing the buildings we have but, just put up, in improving and enlarging those we do not pull down, and ceaselessly changing and altering our handiwork in response to our ever changing needs. It is well for builders and engineers that this should be so for otherwise our towns and cities would-except for the needs of a next generation which bids fair to diminish rather than to increase-so far as building construction is concerned, reach saturation point and our occupations would be gone. Nevertheless we are under bond to see that what we build shall endure for at least as long as it is required -with a liberal margin of strength, for safety, and of durability with which to withstand the unknown factor of time.
APPENDIX (2B). WELDED CONSTRUCTION IN EUROPE. The development of Welded Construction in Europe has been interesting and informative. The illustrations, photographs, and slides will be sufficient to indicate the progress made to date, and include :- Major James Caldwell