[Jewelry making - Article 00305] - Re: [Orchid] Ring Sizing Issues Again

[brian]

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>     [snip] Here are two sizing charts with two different values for a
>     British size "X" inside diameter.
>     http://www.geocities.com/fsubrides/page57.html
>     http://www.niceice.com/ring_sizes.htm One has it at 0.830" and the
>     other at 0.841" 

    Interesting. I wonder is there a translation problem inherent in
    going from US sizes to Brit sizes? Perhaps it's better to ascertain
    the actual diameter in mm for each and compare that. I use a
    spreadsheet to calculate the diameter in mm for all the British sizes
    - first assign a number sequence to each letter A-Z (A=1 etc) then: 

    11.6713 + 0.3937 x <size number> = mm diameter 

    According to this, British X = 21.12mm Translate that to inches.
    Perhaps 0.8314943998? 

    Sorry I don't have a source reference for my method, but Gary
    Wooding wrote in rec.crafts.jewelry a similar formula: 

    Subject: Re: UK ring sizes Date: Mon, 23 Apr 2001 08:05:00 Newsgroups:
    rec.crafts.jewelry .. If you want to use an approximate formula,
    convert the UK letter size to a number (A=1, B=2, C=3 etc) and
    substitute the number for E in the following: UK Size (inches) =
    0.458 + 0.01552 * E As can be seen, the formula is not accurate
    because there is no linear relationship, but its fairly close. 

Brian
Brian Adam
Auckland NEW ZEALAND
www.adam.co.nz


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