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Qualities of the Aggregates
Nothing was brought out in the tests to show marked differences in strengths because of the differences in the nature of the surface of the grains and the effect of smoothness or of differences in the porosity of the grain on the adhesion of the cement to the grain. There was some indication that the smooth and non-porous grain of the Ottawa sand gave slightly lower strength results.
A FURTHER notable step in the long series of experiments carried on during the past twenty years in relation to heat transmission through heavy building materials has to be recorded in the publication of Special Report No. 7 of the Building Research Board.
The following simple problem in Graphic Statics is sfbpplied by The Bennett College, Sheffield, the Governor of which will give a prize of 10s. for the best solution. In allotting points, neatness will receive the same consideration as accuracy.