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A comment on 1953 US Navy training film on mechanical computers [video]. Parent comment
https://en.m.wikipedia.org/wiki/Peening
I dimly recall making an ashtray (hmmm, not sure that would fly these days) in high school metalwork class by beating out a piece of copper sheet with the peen until it was suitably concave.
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https://en.m.wikipedia.org/wiki/Peening
I dimly recall making an ashtray (hmmm, not sure that would fly these days) in high school metalwork class by beating out a piece of copper sheet with the peen until it was suitably concave.