William A. Radford · Radford Architectural Company · leaf 33
inematerial from the crusher stone, and thenremix it in the proportions required by thespecifications, for otherwise, the propor-tions will vary at different points, and onemust pay for an excess of cement to bal-ance the lack of uniformity. If gravel isused it is absolutely essential that it shall… … Fig. 3F-^GeneraI details showing the work at the corniceand the bolt method of construction. average unit transverse strength of 606pounds per square inch for concrete madewith clean gravel, as against 446 poundsper square inch when made with dirtygravel.Best Sizes to Use. In the case of both stone…
