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The fascinating world of letter locking

‘Letter-locking’ is a term coined by MIT conservator Jana Dambrogio, to refer to the techniques used to fold and seal shut letters. She has been investigating many different techniques by which this could be accomplished, ranging from the mainly decorative to the highly secure – so that the receiver could tell instantly if the letter had been tampered with. She has a series of videos on YouTube showing the various methods by which a letter could be locked, supplemented with detailed images on her website, and also this great blog post from the Folger which reminds us of the importance of making models if we want to understand a structure more fully. Currently she is conducting further research with Dr. Daniel Smith of Lincoln College, University of Oxford. Suddenly all those folds, creases and curious slits in the sides of old letters start to make sense…

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