Jaquet Droz signing machine - GIF

Jaquet Droz signing machine.

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Previously:

https://www.homemadetools.net/forum/...805#post156136
https://www.homemadetools.net/forum/...636#post159259
https://www.homemadetools.net/forum/...651#post155592

how did they record the signature?

I'm not sure, my guess is either a set of appropriately designed cams or an engraved follower track.

Here's the company's page about their automata: https://www.jaquet-droz.com/en/watches/automata