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Knight's Mechanical Encyclopedia (ed. Knight) 2 0 Browse Search
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, Pres-er-va′tion of. A process or composition for facing stone or impregnating it, to prevent its destruction by atmospheric influences. Cyclopean masonry. Szerelmey's plan is to saturate with a silicate and apply asphaltum varnish. It has been adopted on the new Parliament Houses of London. Ransome's is to saturate with silicate of soda and then with chloride of calcium. The chemical reaction produces insoluble silicate of lime, and chloride of sodium which washes out. Hibble's plan is to paint with a compound of ground lime, turpentine, flaxseed oil, silicate of lead, and burnt copperas. Davies proposes sulphur and flaxseed oil. Barff and Sullivan: treatment with alumina, carbonate of zinc, and silicate of potash. Hardwicke: potash, alum, fish-oil, and flaxseed oil. Quarm: oil. Bernays: fluo-silicic acid, washed with alkaline solution. Rust and Mossop: solution of caustic barytes, washed with fluo-silicic acid. Gros: a paint of wax 10, oil 3