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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.
In a Paper, entitled “The Structural Aspects of the Great Pyramid,” read before the Yorkshire Branch of the Institution at Leeds on February 7th, 1929, I dealt with the problem of the design and construction of the Great Pyramid from the standpoint of the engineer designing the structure. The paper was published in the July and August, 1929, numbers of “The Structural Engineer." The study now presented is an attempt to deal with the infinitely more perplexing problems that concern the working organisation of the Pyramid builders for the quarrying, working, lifting, and transporting of stone. I do not advance any dogmatic claim in this relation, in view of the fact that previous engineering investigations have failed to produce satisfactory conclusions. My own contribution, however, is in consequence of certain material facts, of fundamental importance, having emerged since previous investigations were undertaken, and my discussion is conducted in the light of the more recent facts. Since the latter relate chiefly to the time-element of the Pyramid- building problem, and, since time is the essence of any organised sequence of building operations, I will deal first with this fundamental element of our investigation. D. Davidson
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