Abstract
W. P. THISTLETHWAITE, Merchant Venturers' Technical College, Bristol, writes : “A few days after the appearance in Nature of October 1.9 (p. 582) of a letter on this subject, a student brought to me a test-tube exhibiting a perfect spiral crack. The tube was new but notched at the mouth, and was being used to heat a mixture of sand and ammonium chloride. Apparently the crack appeared immediately on contact with a bunsen flame ; it originated at the notch in the lip of the tube. That the crack was complete and not merely superficial was shown by the concertina-like behaviour of the tube when pulled.”
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Spiral Cracks in Glass Tubing. Nature 159, 192–193 (1947). https://doi.org/10.1038/159192e0
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DOI: https://doi.org/10.1038/159192e0