On 2-dec-04, at 22:29, I myself wrote:
<x-tad-bigger>A thread that is twice as heavy per length as a structurally similar</x-tad-bigger>
<x-tad-bigger>other thread is not twice as thick but sqrt(2), or 1.41 times as thick,</x-tad-bigger>
<x-tad-bigger>since weight is proportional to volume, and with equal length with</x-tad-bigger>
<x-tad-bigger>diameter. But again 8 / 1.41 is not 6, so there still is no real logic</x-tad-bigger>
<x-tad-bigger>in the 'ought' numbers.</x-tad-bigger>
I rechecked Jean-Guy's web site for the exact denier numbers on UNI 6/0 and 8/0: 6/0 is 130 den and 8/0 is 72 den. 130/72 = 1.81. Sqrt(1.81) = 1.34. 6 * 1.34 = 8.06. So for UNI 6/0 and 8/0 there appears to be a rationale behind the ought numbers after all.
However, the 17/0 still falls short. It is 40 den. 72/40 = 1.8. Sqrt(1.8) = 1.34. 8 * 1.34 = 10.7. SO according to this rationale 17/0 should be 11/0...
Hope this makes sense to some of you ;-)
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