That wood is very nice for working. However, for Douglas fir to work optimally for strength, it has to remain wet. Douglas fir was used in many a mine shaft, but they were misted constantly with water. If allowed to wet and dry, they lost their strength, and shafts collapsed. It took the mining engineers a while before talking with foresters to learn why some mines caved in constantly - it was drier conditions where there wasn't constant water infiltration and wetting of the wood. There is 55+ year old Douglas fir beams holding strong in underground mines in northern Manitoba, not replaced yet. Jason
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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