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DURING the last decade or so experience has shown that, apart from the action of frost and temperature variations, concrete and other masonry structures subject to unilateral
water pressure are also liable to deterioration due to the action of percolating water. This has been experienced specially with dams in countries with primary rock, such as Scandinavia, Finland and certain parts of France and Switzerland, as well as in U.S.A., and the reason seems to be that the river waters in countries of such a geological nature generally do not contain lime, and that they are acid in reaction. Leaky and defective old dams, however, also exist in other parts of the world.
SIR,-with reference to my paper “A Structural Steelwork Review,” which I read
before a meeting of the Institution on April 6th, 1933, and which was published in the
current issue of The Structural Engineer.
The CHAIRMAN (Mr. Ewart S. Andrews, Vice-President) proposed a very hearty vote of thanks to Dr. Faber for his delightful and valuable paper.