Vertical heat treatment process, Edgar Allen Steel Foundry, Sheffield, South Yorkshire, 1962. The process involves the red hot metal (in this case pneumatic drill heads) being cooled in a fluid bath. This changes the properties of the steel and produces a much more durable product. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Heritage Images / Worldwide Photography |
Bildgröße: | 3739 px × 4722 px |
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Eigentums-Rechte: | nicht erforderlich |
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