Using high-speed framing photography operating at 500000 frames per second, it has been shown that in Prince Rupert’s drops of a lead oxide-silica glass containing 24% by weight of lead oxide, the fracture waves propagate at a stable and self-sustained manner at a speed of (1300 ± 100) m s−1. This fracture wave speed is close to the terminal crack speed in the glass. These results, along with those from Prince Rupert’s drops of soda-lime glass reported by us earlier, confirm that the speed of a self-sustained fracture wave in a glass is controlled by the terminal speed of individual cracks in the glass.
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