The settlement of solids in water and its bearing on concrete work

Having been asked by your Secretary to contribute a paper on the above subject, I have much pleasure in placing before you the following notes. The limit of time at my disposal, however, makes it impossihle to give more than a brief outline; but fuller details may be found in my papers before the Royal Geographical Society, Research Department (see Geographical Journals, January, 1911, and March, 1912; before the British Association in Dundee last September (see Engineering, December 20th last); and a paper before the Society of Engineers of March 1, 1909. The last deals especially with the application of the principles of settlement to a works test for efficient mixing of concrete. To these I would refer any who wish to go farther into the matter than it is possible to do here to-night. Dr J S Owens