William A. Radford · Radford Architectural Company · leaf 41
when tested alone. This fact makesit easier for the worker to supply cementmortar which will set as hard as the build-ing materials used. Unless the mortarforms a compact wall as hard as the blocksor bricks it becomes the weakest part ofthe structure. In fireproof buildingsmany defects have been… … Fig. 17—Section of a window frame as constructed in acement plaster house. of the best Portland do not adhere to sandor broken stone when moistened. It isthus necessary that the grinding of thecement be perfect as well as the burning,and to secure the best results uniformly,powdered Portland cement…
