Origin of COE as compatibility measure in studio glass

[Marc Leva]

Originally posted by Lani McGregor
I originally asked this question (started in the prior post) because I honestly don’t know for sure whether Glass Fusing Book One is the original source of this bad science. But from what I’m reading on this board, this (early 1980s in the fusing sector) is where the measured COE as a synonym for compatibility first showed up in studio glass.
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Glassforming;glassmaking for the craftsman by Frederic and Lilli Schuler ©1970 pp.97-98
"When glasses are mixed, it is important that they have the same coefficients of expansion, so that stress is not set up at the interfaces between the different glasses after cooling."