Zipper
This is the first version with thread drive.
It wasn't reliable.
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This is the second version.
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When you twist this krank you can make the chain go around
without turning the arm and that way you can load all the passengers.
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Photo by Markku Jaaskelainen at Tierp, Sweden 1994
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Photo by Mike Reiss
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Video here:
Zipper.mp4
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