Hand book of timber preservation by Rowe Samuel McMath

Author:Rowe, Samuel McMath. [from old catalog]
Language: eng
Format: epub, pdf
Tags: Wood, Preservation of. [from old catalog]
Publisher: Chicago, Pettibone, Sawtell & co., printers
Published: 1904-03-25T05:00:00+00:00

only practicable method to base the requirement upon this quality of the timber and let it be determined by actual trial. It is well known that the oil, especially the heavier and more valuable portion, cannot be forced into the timber to the extent that is possible with the aqueous solutions without undue pressure that will injure the timber and result, after the pressure is removed, in a great waste of the oil.

CREOSOTING.

Note (a). —Another method of impregnating with creosote oil is that of boiling the timber in the retort without pressure until the impregnation is complete. This is covered with patent.

Note (b). —^Then, again, we have the Giussanni process, the creosote being contained in an unsealed vat of sufficient length (250 feet or more) supplied with heating coils, by which the oil is maintained at a high (boiling) temperature and the ties are loaded in sets of four or eight and carried through the vat at a very slow rate, allowing time enough to drive off all moisture, and finally the ties are plunged into a vat of cold oil for a few minutes and then discharged. In the process proper there is a tank of chloride of zinc solution, interposed between the hot immersion and the cold, the chloride solution being cold, by which the inner part of the tie is im-pregTiated with the chloride. The whole process is carried through automatically from the time the sets of ties are clamped in until they are discharged with treatment completed.

Note (c). —"The Rueping process" consists simply in pressing the oil into the timber. It is operated on the principle that by the application of air pressure the air in the timber is reduced to one-half of its volume, then the oil is let in at that pressure, and then, by means of the force pump, the air is still further compressed, the oil forced into every part of the piece, then all pressure is released and the compressed air is allowed to force a part of the oil

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