Zipper
This is the first version with thread drive.
It wasn't reliable.
| 
This is the second version.
| 
| 
| 
| 
| 
When you twist this krank you can make the chain go around
and that way you can load all the passengers.
| 
| 
| 
| 
| 
Photo by Markku Jaaskelainen at Tierp, Sweden 1994
| 
Photo by Mike Reiss
| 
|