The upper edge of the pan was ground at a precise angle or bevel based on the coefficient of elasticity of the particular type of glass plate that was being used.
2.
The " non-variable " refers to the alloy's most notable property : that it has a low temperature coefficient of elasticity; its elasticity does not change much with temperature, There are several versions of the Nivarox alloy depending upon the intended application : Nivarox-CT, but also with suffixes CTC, M, W . Chemical compositions vary in wt % as follows for all Nivarox alloys : Iron as balance, a wide variation in nickel between 30-40 %, beryllium 0.7-1 %, some versions have molybdenum at 6-9 % while others have instead chromium 8 %, titanium is present in some compositions at 1 %, manganese at 0.7-0.8 %, silicon 0.1-0.2 % and carbon in traces up to 0.2 %.
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