Monday, December 20, 2021

Sealed with a Spiral

 From Ars Technica:

On the eve of her execution for treason in February 1587, Mary, Queen of Scots, penned a letter to King Henri III of France and secured it with a paper lock that featured an intricate spiral mechanism. So-called "letterlocking" was a common practice to protect private letters from prying eyes, but this spiral lock is particularly ingenious and delicate because it incorporates a built-in self-destruct feature, according to a new paper published in the Electronic British Library Journal.

The authors are an interdisciplinary team of researchers working under the umbrella of the Unlocking History Research Group. In this paper, they describe a dozen examples of a spiral lock in letters dated between 1568 and 1638, including one from Mary's former mother-in-law, Catherine de Medici, as well as her arch-rival, Elizabeth I, who signed Mary's death warrant. (Read more.)
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