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The Structural Engineer

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 Structural Engineer

The CHAIRMAN (Mr. R. H. HARRY STANGER, Vice- President) said the audience had shown by their acclamations that the paper had been interesting. He was sure they were extremely obliged to Mr. Davidson for giving so much time to the subject, and for coming to the meeting and delivering his lecture.

The Structural Engineer

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

The Structural Engineer

One very convincing sign that tlhe use of structural steel work in this country has far from reached its zenith is the making of new records-either for size of erection or for speed of assembly-almost weekly.

The Structural Engineer

1. Haulage Data. Haulage on Permanent Ways. Erman, quoted by Petrie("Descriptive Sociology")states that "when blocks of moderate size had to be conveyed along comparitively good roads, oxen were harnessed into the sledge. However, ... men were employed for this heavy work." D. Davidson

The Structural Engineer

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.

The Structural Engineer

There is persistent agitation for increased stresses and reduced loadings upon steelwork, and in the author's opinion any such steps must necessarily be accompanied by improvements in design or the standard of work will suffer. Charles S. Gray

The Structural Engineer

One of the most interesting and important developments of recent years is the manufacture and sale of concrete delivered to the job, mixed and ready for use. In the United States and Canada there are over a hundred p1ants delivering commercially, concrete to the contractor, ready for use. D.H. Burrowes