Est autem unum genus scansorium, quod graece acrobaticon dicitur; alterum spirabile, quod apud eos pneumaticon appellatur; tertium tractorium, id autem Graeci baru ison vocitant.
The first kind of machine is of ladders (in Greek acrobaticon); the second is moved by the wind (in Greek pneumaticon); the third is by traction (in Greek baru ison or equilibrium).
final_alignments\Vitruvius_Architecture_Book_10.json