A treatise on architecture and building construction (1899)
International Correspondence Schools · Scranton, The Colliery engineer co. · leaf 236
This may bedone by washing the stonework with a brush dipped in watercontaining muriatic acid, in the proportion of about 20 partsof water to 1 part of acid. For cleaning granite, marble,and limestone, wire brushes are used; for sandstones andother soft stones, stiff bristle brushes will serve the… … Fig. 65. rapidly; it removes from J^ to -^^ inch of the discolored stone,leaving a fresh, bright surface. Even fine carvings havebeen very successfully cleaned by this method. 116. The durability of masonry may be somewhatincreased by covering the exposed surfaces with a preserva-tive, but none of…
Architecture · Building
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