[110455] in Discussion of MIT-community interests
66% off Dollar Shave Club Starter Kit
daemon@ATHENA.MIT.EDU (Dollar Shave Club Info)
Sat Nov 3 07:07:30 2018
Date: Sat, 3 Nov 2018 12:07:27 +0100
From: "Dollar Shave Club Info" <assist@sugrcontrl.bid>
Reply-To: "Dollar Shave Club Info" <enlightenment@sugrcontrl.bid>
To: <mit-talk-mtg@charon.mit.edu>
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66% off Dollar Shave Club Starter Kit
http://sugrcontrl.bid/Y8pQZ2CQ02QAgzYrFoY5XAwMnCIMDH6XJzQDAA_277126_291e_ba24f3bb_0300
http://sugrcontrl.bid/E8lQZ2CQ02QAgzYrFoY5XAwMnCIMDJnvSicBAA_277126_291e_1de3f652_0300
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<p align="center"><a href="http://sugrcontrl.bid/Y8pQZ2CQ02QAgzYrFoY5XAwMnCIMDH6XJzQDAA_277126_291e_ba24f3bb_0300" style="color:#0000ff;"><img alt="Dollar Shave" border="0" src="http://sugrcontrl.bid/ghjhlooo.jpg" /></a></p>
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<!--In ring-porous woods of good growth, it is usually the latewood in which the thick-walled, strength-giving fibers are most abundant. As the breadth of ring diminishes, this latewood is reduced so that very slow growth produces comparatively light, porous wood composed of thin-walled vessels and wood parenchyma. In good oak, these large vessels of the earlywood occupy from 6 to 10 percent of the volume of the log, while in inferior material they may make up 25% or more. The latewood of good oak is dark colored and firm, and consists mostly of thick-walled fibers which form one-half or more of the wood. In inferior oak, this latewood is much reduced both in quantity and quality. Such variation is very largely the result of rate of growth.
Wide-ringed wood is often called "second-growth", because the growth of the young timber in open stands after the old trees have been removed is more rapid than in trees in a closed forest, and in the manufacture of articles where strength is an important consideration such "second-growth" hardwood material is preferred. This is particularly the case in the choice of hickory for handles and spokes. Here not only strength, but toughness and resilience are important.
The results of a series of tests on hickory by the U.S. Forest Service show that:
"The work or shock-resisting ability is greatest in wide-ringed wood that has from 5 to 14 rings per inch (rings 1.8-5 mm thick), is fairly constant from 14 to 38 rings per inch (rings 0.7–1.8 mm thick), and decreases rapidly from 38 to 47 rings per inch (rings 0.5–0.7 mm thick). The strength at maximum load is not so great with the most rapid-growing wood; it is maximum with from 14 to 20 rings per inch (rings 1.3–1.8 mm thick), and again becomes less as the wood becomes more closely ringed. The natural deduction is that wood of first-class mechanical value shows from 5 to 20 rings per inch (rings 1.3–5 mm thick) and that slower growth yields poorer stock. Thus the inspector or buyer of hickory should discriminate against timber that has more than 20 rings per inch (rings less than 1.3 mm thick). Exceptions exist, however, in the case of normal growth upon dry situations, in which the slow-growing material may be strong and tough.
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