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THIS specification covers the design of bridges, and is a notable addition to the matter extant upon this subject. It is interesting as there is no other generally-known specification in this country with which to compare it; and it is difficult to find any text books which cover all the points of design called for in this specification, except by having recourse to matter published abroad. The specification appears to be moulded along the lines of the Canadian and American, and to some extent the German specifications, and comparison with these is interesting.
Sir,-I find it difficult to reply to Mr. F.E. Drury’s criticism of my article on the above subject, as he has so largely misunderstood my argument and has ascribed to me views which I do not hold.
Calcium Chloride in Cement If from 6 to 10 per cent of calcium chloride is added to cement on mixing when the temperature is below 20 deg. Fahr., not only is freezing prevented, but setting is hastened and increased hardness secured. But such all addition is not safe in reinforced work unless the steel is completely imbedded. In ordinary rendering on metal lathing, there were early signs of bad deterioration of the lathing. (U.S.A., Bureau of Standards)