THE KYAN PROCESS.
This was probably the first wood preserving process used in the United States, and it is yet among the best. But its usefulness is limited, because the preservative employed is so expensive.
The timbers are placed in open non-metallic troughs filled with mercury bichloride solution and held below the surface .
of the solution by heavy wight such as large stones. It is compara tively easy to obtain good results from the Kyan process in almost any locality. An ordinary oil cask is enough to hold several fence posts with sufficient solution to influence the portions with which the solution comes into contact.
It will be remembered that mercury bichloride dissolves in very hot water, and that the strength of the solution, which diminishes as wood is soaked in it, must be brought back to the required limit whenever necessary. It will also be remembered that mercury bichloride is poisonous to human and that it attacks iron. The Kyan method, which requires less expert care than any other, was suggested in 1832 by an Englishman named Kyan.