Letterlocking: The Hidden History of the Letter

by Daniel Starza Smith and Jana Dambrogio

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 securing a letter using a combination of folds, tucks, slits, or adhesives...

• Format: Hardcover
• Language: English
• ISBN: 0262049279
• ISBN13: 9780262049276
• Release Date: March 2025
• Publisher: MIT Press
• Length: 528 Pages