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Unlocking History Research Group
Sealed letters folded in intricate patterns have gone unread for more than 300 years, but now people have been able to tease out their contents with a combination of X-ray imaging and unfolding algorithms.
Such folded letters were common before the invention of the envelope. Letters were folded multiples times with tucks or slits and often sealed with wax. The paper they are written on is now so fragile that opening them up can damage them.
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“Studying folding and tucking patterns in historic letters allows us to understand technologies used to communicate,” says Jana Dambrogio at the Massachusetts Institute of Technology. Now, her team is able to reconstruct what is inside without damaging the letters.
New Technique Reveals Centuries of Secrets in Locked Letters
M.I.T. researchers have devised a virtual-reality technique that lets them read old letters that were mailed not in envelopes but in the writing paper itself after being folded into elaborate enclosures.
The computer-generated unfolding sequence of a sealed letter.Credit.Unlocking History Research Group
Published March 2, 2021Updated March 4, 2021
In 1587, hours before her beheading, Mary, Queen of Scots, sent a letter to her brother-in-law Henry III, King of France. But she didn’t just sign it and send it off. She folded the paper repeatedly, cut out a piece of the page and left it dangling. She used that strand of paper to sew the letter tight with locking stitches.