#letterlocking

New technology for digitally unfolding history letters.

(I’m @historyb00ks over on TikTok).

Article is here and free to read : Unlocking history through automated virtual unfolding of sealed documents imaged by X-ray microtomography https://www.nature.com/articles/s41467-021-21326-w

Description The rich history of a centuries-old document security technology—folding and securing a letter into its own envelope for delivery—and a comprehensive guide to learning how to make your own locked letters. Before the invention of the gummed envelope in the 1830s, how did people secure their private letters? The answer is letterlocking—the ingenious process of folding, slitting, and securing a letter with a strip of paper and sealing wax so that it becomes its own envelope. The practice, used by historical figures ranging from Elizabeth I and her spymaster to Japanese samurai lords, and nearly entirely forgotten, was an everyday activity for centuries, across cultures, borders, and social classes. In Letterlocking, Jana Dambrogio and Daniel Starza Smith, experts who have pioneered the field over the last ten years, tell the fascinating story of letterlocking within epistolary history, drawing on real historical examples from all over the world. Letterlocking will be accompanied by a website, freely accessible scholarly articles, and instructional videos and diagrams, as well as foldable, tear-out sheets with instructions on how to fold and lock a letter. 

Thank you, @barnesandnoble for offering a pre-order discount to your members April 19, on our book “Letterlocking: The Hidden History of the Letter” #BNPreorder 

#mitpress #letterlocking #amsr #origami #documentsecurity #letters #correspondence #fold #diy #security #seal #secret #love #write #encryption #spies #invisible #teaching #instructions #book #publication #launch #video #share 

https://www.barnesandnoble.com/w/letterlocking-jana-dambrogio/1145200759?ean=9780262049276

Alt text: A sparkling star made of magenta and yellow. In the center the date: March 4, 2025. Blue background with white lettering that says, "Letterlocking, The Hidden History of the Letter by Jana Dambrogio, Daniel Starza Smith, with the Unlocking History Research Group. Pre-order now @mitpress @penguinrandomhouse @amazon @barnesandnoble @bookshop_org @Indiebound @indigo @booksamillion

Thanks to Eirene Pianeta for sharing the gif design template in Canva. 

Citation information: Authors: Jana Dambrogio and the Unlocking History Research Group. Title: "Surprise: It's Happening! Letterlocking: The Hidden History of the Letter. Pub date: March 4, 2025, USA (2024))." Letterlocking Instructional Videos. Unlocking History number 6261/Letterlocking Unique Video number: 0304. Date filmed: April 19, 2024. Duration: 1:52. Date posted: April 19, 2024. Video URL: [Insert URL]. Date accessed: [Date].

Copyright 2024. Jana Dambrogio and Massachusetts Institute of Technology (MIT). All rights reserved. The following copyrighted material is made available under the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) License https://creativecommons.org/licenses/by-nc/4.0/. Contact the MIT Technology Licensing Office for any other licensing inquiries.

(via Mary, Queen of Scots, sealed her final missive with an intricate spiral letterlock | 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.

I want to share this YouTube channel I found with y'all that really got me into this. Letterlocking Videos on Youtube: