In order to prevent wooden posts, piles, etc.,from rotting, dip the parts to be sunk in the earth in the following composition:--Fine, hard sand, three hundred parts; powdered chalk, forty parts; resin, fifty parts; linseed oil, four parts. Heat these together in a boiler, then add red lead, one part; sulphuric acid, one part. Mix well together, and use while hot. If too thick, more linseed oil may be added. This composition when dry attains the consistency of varnish, and becomes extremely hard.
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