By B A Richardson
This variation of this complete learn of nationwide and overseas study and alertness into wooden upkeep is either good particular and extensive in coverage.
The textual content covers the heritage of maintenance: the anatomy of timbers and their breakdown, renovation rules, fabrics and strategies.
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Extra info for Wood Preservation
The bark-borer Ernobius mollis lays eggs in cracks in the bark of dry softwood logs or bark still attached to the waney edges of sawnwood. The hatching larvae explore the phloem in search of nourishment and loosening the bark, but the galleries sometimes extend for a distance of up to 12 mm (1/2 in) into the sapwood. These holes in the sapwood are sometimes confused with those of the Common Furniture beetle Anobium punctatum but they tend to be rather larger in diameter and they are invariably associated with galleries under the bark; the bark may have fallen away from the adjacent waney 26 edge but the galleries can still be recognized.
Unfortunately the various wood-destroying insects and fungi are unable to distinguish between forest waste and wood in useful service. In the past wood was used principally in forest areas where it was readily available. Degrade was accepted but replacement was comparatively simple and inexpensive. In contrast, wood is now a valuable commodity and transported considerable distances between the production forest and the ultimate user. It is essential for wood to be utilized efficiently in order to conserve world resources but also to avoid unnecessary cost, both to the individual user and to importing nations as a whole.
The alternative is to measure the saturated moisture content of the sample by weighing firstly when wet and subsequently after over-drying. The amount of water loss is then related to the dry mass to give the saturated moisture content and this can be directly related to the period of immersion. This technique is sometimes used by archaeologists to estimate the age of an ancient structure when they are able to obtain waterlogged wood samples from, for example, a sunken boat or piles driven into a bed clay.