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Sir - Referring to Mr. Wilson’s letter of November 15 last, published in the December issue, page 483, I have pleasure in replying to the points raised by him.
THE CHAIRMAN, Mr. R. H. Stanger (Vice-President), in proposing a vote of thanks to Mr. Gueritte for his paper, said that, although he had not been closely connected with the problem of the design of cooling towers of reinforced concrete, he had had to test, some of the materials used in their construction, and could testify to the excellence of those materials. As one who had had to work at heights of 80 ft. or so on a 9-inch plank when serving his t.ime, and knowing how uncomfortable one could feel under such circumstances, he was particularly appreciative of the ingenious manner by which the scaffolding was erected on the insides of the towers, as described in the paper.
In 1925 some difficulties occurred in connection with some concrete aggregates for a fairly large reinforced concrete structure in Yorkshire. Tests were carried out on various types of aggregate, and a consideration of the results of these tests led to the investigations which I now propose to describe. Gilbert Ness