In walls of masonry the first question must be with regard to the sand, in order that it may be fit to mix into mortar and have no dirt in it. (Vitruvius)

In walls of masonry the first question must be with regard to the sand, in order that it may be fit to mix into mortar and have no dirt in it.

Vitruvius

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dirt fit masonry mix mortar order question regard sand

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