. Elements of forestry. Forests and forestry. 234 ELEMENTS OF FORESTRY called " cylinder buggies," and pushed on the tracks from the yards directly into huge horizontal cylinders about six to eight feet in diameter and up to one hundred and fifty feet in length. These cylinders are constructed to withstand high pressure and the heavy doors are hermetically sealed. At first live steam is introduced into the cylinder and a pressure of about. Fig. 43. — High-pressure Cylinders used in Treating Ties, Oak- land, California. Ties are run into the cylinders on trucks and impregnated with cr
. Elements of forestry. Forests and forestry. 234 ELEMENTS OF FORESTRY called " cylinder buggies," and pushed on the tracks from the yards directly into huge horizontal cylinders about six to eight feet in diameter and up to one hundred and fifty feet in length. These cylinders are constructed to withstand high pressure and the heavy doors are hermetically sealed. At first live steam is introduced into the cylinder and a pressure of about. Fig. 43. — High-pressure Cylinders used in Treating Ties, Oak- land, California. Ties are run into the cylinders on trucks and impregnated with creosote or other preservatives to increase their durability. twenty pounds per square inch maintained for several hours, depending on the species, their size and moisture content. This steaming softens the wood fibers and opens up the pores in the wood. The steam is then led off and a vacuum applied. This exhausts the air in both the cylinder and the wood structure itself and prepares the way for the penetra- tion of the preservative fluid. The vacuum is maintained. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Moon, Frederick Franklin, 1880-1929; Brown, Nelson Courtlandt, 1885-. New York J. Wiley
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
