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Old 08-06-2017, 01:43 PM
Ron Mynatt Ron Mynatt is offline
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Factors for calculating LEC English and Turner

I am looking to confirm the English and Turner Factors for calculating the LEC for my recipe.Since I have been told the lithium carb factor is too low I thought I should double check the other ones to make sure.I thought I got them from Glass Notes 3rd edition but I gave that copy away .I've called the Library at Corning but have not heard back from them.Does anyone have a source for them?
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Old 08-06-2017, 04:09 PM
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Pete VanderLaan Pete VanderLaan is offline
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you did get them from glassnotes 3rd. Croucher established the corrected factor based in Appen which bears out in a physical measurement, which is how it was done in the first place. You'll find it in Glassnotes 4th.

What you won't find in the 4rh is the factors for metallic oxides. They're simply hopelessly totally wrong and are based in a completely different temperature range in a study done for the enamelling industry back around 1925. Paul Manners put those factors in an article he wrote for Glass Magazine called "custom made to Fit" in or around 1977. That was the first error. Then, Henry canonized it putting it into the 3rd edition.

I suggested that he remove it based on the evidence, and he did.

There simply are no factors for the colorants and never have been.
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Old 08-06-2017, 07:11 PM
Peter Bowles Peter Bowles is online now
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Quote:
Originally Posted by Pete VanderLaan View Post

There simply are no factors for the colorants and never have been.
That would make a fascinating Masters project
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Old 08-07-2017, 07:31 AM
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Pete VanderLaan Pete VanderLaan is offline
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The reason is simple. Industry simply does not laminate color to clear. They have no interest. Studio glass scarcely has any interest since 98% of studios use color rods. The economics aren't there and those of us who do make color pretty well already know what we can and can't get away with.

So, you're right it would make an interesting study
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Old 08-11-2017, 05:36 PM
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Sky Campbell Sky Campbell is offline
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Didn't Brad Shute develope a spreadsheet just for this purpose?
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Old 08-11-2017, 06:08 PM
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Pete VanderLaan Pete VanderLaan is offline
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he got his spreadsheet from me. The factor for lithium was what John Croucher worked up from Appen. I use it. The others are fine. There are none for metallic oxides.
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