Light visible and invisible : a series of lectures delivered at the Royal Institution of Great Britain, at Christmas, 1896 (1897)
Thompson, Silvanus Phillips, 1851-1916, Royal Institution of Great Britain · New York : Macmillan · leaf 173
ur in itself, but which has been suddenly chilled. Its state of permanent strain is at once revealed by the peculiar pattern and the dull tints that seem to form around a distorted cross radiating from its centre. A 1 The extreme case is presented by Ruperts drops, whichare drops of melted glass… … second square of glass which has been still more suddenlycooled shows the same black cross (Fig. 98), but the tints in the corners of the square runup into the second order. Hereagain is a short cylinder of glasswhich was suddenly chilled allround its outside. The peripheralsurface has contracted…
Light · X-rays
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