In the Middle Ages miners used huge bellows to pump fresh air into the mines.
Turn the handle and the linkage will move the bellows up and down and the arms of the miner will move correspondingly.
Author: Walter Ruffler
Crank mechanism Size: 12 x 6 x 24 cm
3 construction sheets DIN A 4
Difficulty class: middle
Published by: Walter Ruffler Paper automata