SIC MUNDUS PENDET ET IN NULLO PONIT VESTIGIA FUNDO

translatable as:

"Thus the World is suspended, resting its feet on no foundation"

Inscriptions of this kind were a standard feature of the illustrations of Jesuit emblem books during the seventeenth century. 

Kircher's machine, like that of Line, belongs somewhere in between the culture of creating enigmatic emblems to be deciphered by an elite audience, and the culture of experimental natural philosophy promoted by the early scientific societies.