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Dec 10, 2021, 6:44 pm323 pts
Ars Technica
Enlarge / Four vector drawings show the five-slit spiral lock mechanism used by Mary, Queen of Scots; the front and back of a locked letter packet using this method; and an unfolded lock. Sections are numbered 1-20 to show the different areas created by folding. (credit: Unlocking History Research Group) On the…
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