Fig. 1: Four letterlocking examples from the Brienne Collection. | Nature Communications

Fig. 1: Four letterlocking examples from the Brienne Collection.

From: Unlocking history through automated virtual unfolding of sealed documents imaged by X-ray microtomography

Fig. 1

For each letterpacket (DB-1538, DB-1627, DB-1976, and DB-2040; “DB” numbers in this article refer to shelfmarks): a outside of letterpacket, front, and back; b transparent view through the volumetric XMT data showing varied distribution of layers across the letterpacket; c crease pattern that would be visible on the paper if fully opened, stylized from the output of virtual unfolding; d proposed step-by-step letterlocking process to make this packet from a flat piece of paper, based on virtual unfolding results; e letterlocking category (LC#) assigned based on virtual unfolding findings, letterlocking categories, and formats chart (see Fig. 7), apart from opened letter DB-2040, assigned based on surviving letterlocking evidence. For videos of the letterlocking process for each letter, see our Supplementary website brienne.org/unfolding. Scale bars: a 10 mm.

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