Bonjour Charlie,
Just amazing indeed, do you know if it is a "Corliss" type steam machine ?
Here is the description from the creator:
"two cylinder compound steam engine
Cylinder drilling for the high pressure cylinder: 12 mm
Low pressure: 16 mm Hub: 20 mm
Machine length: 23 cm Width: 18 cm
Max pressure: 2 bars Min pressure: 0,3 bars
In the video the machine is running on 0,3 bars compressed air."