Abstract: In this section we will take a close look at twelve historical letters, written on paper from the 1580s to the 1970s, that demonstrate some distinctive features or techniques of ...

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 ...

Over recent years we’ve been treated to a series of fascinating advances in the world of x-ray imaging, as researchers have developed their x-ray microtomography techniques and equipment to the point ...

Researchers at the MIT Libraries have managed to read a 300 year-old letter without even opening it. A computer-generated sequence of the letter unfolding. Image via ...

An example of letterlocking – where people doubled letters as envelopes to ensure the security of a document – the fallen monarch used a spiral locking process to seal a message that was “a last will ...

Keys: How to Use this Book -- Introduction to Letterlocking -- Building the Story of Letterlocking -- Reading Letterlocking Features -- Locking Mechanisms, Security, and Authentication -- Distinctive ...

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 ...