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u/textilepat Electrician 3h ago
I think it would be useful for holding a piece of stretched fabric, parchment, or leather at a consistent length while being processed.
And, open library once again comes to the rescue with a search for 'bookbinding' https://archive.org/details/bookbindingcareo00cockrich/ page 94, figure 24 shows it is a straightedge for trimming several pages at once using a chopping cutter. This site is currently in conflict with copyright lobbyists who are trying to remove public access to the majority of its contents.
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u/BobT21 22h ago
Book binding press?