Lumber, its manufacture and distribution . Anti-Stain Co. vs. Geo. Nester, John Nester, et al. 3 See The Prevention of Sap Stain in Lumber, by H. F. Weiss and C. T. Barnum,U. S. Dept. of Agriculture, Forest Service, Circular 192, 1911. AIR-SEASONING 221 placed at the far side of the tank up which the dipped lumber passeson its way to the assorting table. The solution should be kept at a temperature of approximately140° F. which is accomplished by means of a live-steam coil placed inthe bottom of the tank. Most of the sawdust from the edging and trimming processes, whichis on the boards when th
Lumber, its manufacture and distribution . Anti-Stain Co. vs. Geo. Nester, John Nester, et al. 3 See The Prevention of Sap Stain in Lumber, by H. F. Weiss and C. T. Barnum,U. S. Dept. of Agriculture, Forest Service, Circular 192, 1911. AIR-SEASONING 221 placed at the far side of the tank up which the dipped lumber passeson its way to the assorting table. The solution should be kept at a temperature of approximately140° F. which is accomplished by means of a live-steam coil placed inthe bottom of the tank. Most of the sawdust from the edging and trimming processes, whichis on the boards when they fall upon the skids C, is collected in the dustspout. Some, however, is carried over into the vat, and the accumula-tions should be removed from the tank every few days. This is accom-plished by draining the solution from the tank through the pipe D,and later returning it to the tank for further use. It requires about of soda to dip 1000 board feet of lumber when the work isefficiently done and there is no waste of the Fig. 139.—The Cross-section of a Metal Tank used in dipping Lumber to preventSap Stain. A. A By-pass for Lumber which is not dipped. B. One of the Armswhich span the Gap between the Assorting Table and the By-pass. C. Oneof the Skids on which the Lumber drops as it passes through the Tank. All lumber may be dipped at mills having a limited output in whichcase the by-pass feature of the tank is omitted. Various home-madetanks are in use, many of them made from planks. The lumber isusually held against the conveyor chains by some form of suspendedidler wheels, the lumber passing under the rim of the wheels and ridingon top of the chain. Dipped stock must be open-piled so that there will be ample ventila-tion, and dry stickers should be used. Lumber left in solid piles forsome days before sticking or lumber which has been rained upon,will stain even though dipped. One objection raised against dippedlumber is that the boards dull the planing-ma
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