. A manual of the timbers of the world : their characteristics and uses : to which is appended an account by S. Fitzgerald of the artificial seasoning of timber. Timber. v/i^/y* FLOOR PILIhG Door End. '!?s^!77^si77;s^^77i$^t^7;^^^!7z^^<^:^^yy<ii^'ff7'7is-'- TRUCK PILING IN COMPARTMENT DRYER. Supervision.—A timber dryer must work continuously, day and night, as well as on Sundays. Apart from the bad effects of changes in temperature, there is no economy in working only in the daytime, as the heat cannot be resumed after a stoppage at the point arrived at before it ceased, but must be rega
. A manual of the timbers of the world : their characteristics and uses : to which is appended an account by S. Fitzgerald of the artificial seasoning of timber. Timber. v/i^/y* FLOOR PILIhG Door End. '!?s^!77^si77;s^^77i$^t^7;^^^!7z^^<^:^^yy<ii^'ff7'7is-'- TRUCK PILING IN COMPARTMENT DRYER. Supervision.—A timber dryer must work continuously, day and night, as well as on Sundays. Apart from the bad effects of changes in temperature, there is no economy in working only in the daytime, as the heat cannot be resumed after a stoppage at the point arrived at before it ceased, but must be regained gradually. The loss of time is therefore much greater than the actual time of stoppage. The dryer must be definitely in the charge of some responsible person who is capable of attending to the instruments, of making moisture tests and keeping records. This does not mean that his whole time will be occupied on the dryer, but that visits must be made at regular intervals during the day-time, and occasional superintendence provided for during the night. Records of what is happening between the x-isits are kept by the recording instruments. Besides spUtting and warping, which are very obvious faults, there is an error which can be made in drying timber which is not apparent to the eye, but which is quite as harmful. If the restraining action of moisture is omitted or improperly controlled, there is a tendency for the surface of the timber to dry and harden to such an extent that it becomes quite impervious to the passage of moisture, thereby preventing the interior from drying, even if given a much longer time than usual. If the timber is discharged in this "case-hardened" condition, and then sawn up, the wet interior wood would lose its moisture and shrink, while the surface wood remained dry. The result would be bad warping and twisting. Case-hardened wood can sometimes be corrected by thoroughly. Please note that these images are extracted from scanned page imag
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherlondo, bookyear1920
