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UNDER this title, an endeavour will be made to give the ultimate results of practical experiments with concrete mixtures whiah have been carried out intermittently over a period of four years. The author has made his investigations as opportunities lent themselves, and found himself, after his first series of experiments, obliged to tear up the results of much labour, and persist later in a more thorough manner. This has happened several times, and this paper will be practically confined to the results of 1923, and as such, will be referred to here.
B. Price Davies
Two Structural Failures
Sir,-Recently two structural failures occurred, which have been considered of sufficient public interest to be described in the Literary Digest, a periodical that collates Press opinion and gives excerpts of matters of unusual interest. One of these was the Gleno dam failure in Italy. The other was the total collapse of a 200-room hotel building, seven stories of which had been constructed. The latter structure was a
reinforced concrete building in Benton Harbour, Michigan, U.S.A.
THE cost of grinding the raw materials, coal and finished cement is a considerable proportion of the total cost of cement manufacture. With a view to reducing this cost of grinding, the British Portland Cement Research Association has carried out a comprehensive research dealing with some of the fundamental principles governing the crushing of materials used in cement manufacture to a greater degree of fineness.
Chas E. Blyth, Geoffrey Martin and Harold Tongue