Mary, Queen of Scots used ‘spiral locking’ technique to preserve secrecy of last letter before her execution
By Sana Noor Haq, CNN Mary, Queen of Scots used a “spiral locking” technique to seal the last letter she wrote before her execution, indicating that she wanted the contents to remain secret, according to research published in the Electronic British Library Journal. An example of letterlocking — where people doubled letters as envelopes to
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