. Canadian forest industries 1907. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. TO THE AT CD TIMBER YARD -Z%6ftAO£ SECTION THROUGH AS SECTjQN TtlKOUSH<f-0 Diagram of a Small Commercial Plant for Treating Mine Timbers, Cross-Ties, Cross-Arms, Etc. Amount of Absorption and Depth of Pene- tration. In the treatment of any timber by any process, the added life is directly proportional to the amount of absorption and the depth of the penetration secured. But where an ex- pensive preservative is used, or where only a limited service is desired, it is
. Canadian forest industries 1907. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. TO THE AT CD TIMBER YARD -Z%6ftAO£ SECTION THROUGH AS SECTjQN TtlKOUSH<f-0 Diagram of a Small Commercial Plant for Treating Mine Timbers, Cross-Ties, Cross-Arms, Etc. Amount of Absorption and Depth of Pene- tration. In the treatment of any timber by any process, the added life is directly proportional to the amount of absorption and the depth of the penetration secured. But where an ex- pensive preservative is used, or where only a limited service is desired, it is often neces- sary to limit the absorption of the preserva- tive and so, in a measure, lessen the penetra- tion. It was in the effort to determine some method by which the amount of absorption and penetration of the preservative could be controlled with a fair degree of accuracy that the true respective values of hot and cold baths were demonstrated. It is now established that the hot bath should be continued long enough to heat the timber and expand the air through a deeper zone than it is desired to penetrate with the preservative; and that the depth of the pene- Temperature. The temperature used in the open-tank treatment must depend on the nature of the preservative and the condition of the timber. If water solutions are employed, the hot bath should be carefully kept at the boiling point. If the temperature is allowed to fall intermit- tently during the treatment, the vacuum in the timber will be partially destroyed by the entrance of the preservative, which' will ob- struct the escape of the air when the tem- perature again rises. With complex and ex- pensive preservatives, such as creosote oil, the temperature should be kept as low as is con- sistent with securing the desired penetration, since the loss by volatilization during the treatment is almost directly proportional to the temperature and duration of the hot bath. For this reason the tank should be so con- struct
Size: 1868px × 1338px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectforestsandforestry
