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  5. The sand should be neither coarse nor fine but of a...

The sand should be neither coarse nor fine but of a middling quality or about the size of the common pop(p)y seed. If the sand is too coarse the mortar will be short or brittle . . . If the sand is too fine the cement will shrink and crack after it has been used.

Canvass White
Engineering, Quality, Cracks
The sand should be neither coarse nor fine but of a middling quality or about the size of the common pop(p)y seed. If the sand is too coarse the mortar will be short or brittle . . . If the sand is too fine the cement