OCR Text |
Show New Method Devised For Treating Posts A new method of treating fence posts and freshly sawed green lumber lum-ber has been originated at the Lake States forest experiment station. This procedure, the "dry salting" method, consists of applying a mixture mix-ture of copper sulphate and sodium dichromate in powder form to the surface of freshly peeled green posts and freshly sawed green lumber. lum-ber. The mixture of these chemicals dissolves In a humid atmosphere and clings to the surface of moist posts and lumber when applied as a Dowder. The method results in deep penetration pene-tration of the preservative which appears to be firmly fixed in the wood so that it is not readily leached out. A definite advantage of this process over any other now available is that treatment can be concentrated at the ground line and top where more protection against decay is needed. The resulting post, have an attractive blue color which is not readily leached out, and tests indicate that the preservative i, relatively rela-tively noncorrosive to staples and wire. |