William A. Radford · Radford Architectural Company · leaf 32
ftheir value in concrete are approximatelyas follows: 1, trap; 2, granite; 3, gravel;4, marble; 5, limestone; 6, slag; 7, sand-stone; 8, slate; 9, shale; 10, cinders.Another difficulty in the way of an accuratecomparison is the variation in the ages ofstone of the same classes. The value of CEMENT… … Fig. 2S—General details of construction from founda-tion to the first floor level. Selection of Stone. The quality of theconcrete is affected by the hardness of thestone. In all cases porous stone like sand-stone should be avoided. The shape andsize also have their influence. If brokenstone is used…
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