ccount ducing it the exact degree of softness which will give the ; for the above, that the exterior of the glass cooled first, and the tear depends especially on the existence of the parts of required flexibility and toughness. The latter process is solidified, while the material within, cooling… … was prevented by its rigid envelope from contracting, and | brought to a lower temperature during a shorter time, the effects hence remained in a state of fixed dilatation. Consequently, | of tempering are only lessened. | according to this theory, on breaking the outer envelope, the , The…
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