| 摘要 |
Non-contact thermal cutting is done reliably, yielding cut pieces of glass having edge strength never hitherto reliably achieved. A suitably delineated infrared source is positioned at one focus of an elliptical reflector means, thereby causing its energy to be concentrated at a focus locus that is caused to coincide with one surface of the piece of glass to be cut along an intended line of fracture, the infrared source being such as to generate in the piece of glass to be severed a stress of at least 725 grams per square millimeter.
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