Instrument for perpetual flute, with two spheres

Abstract

It is an instrument for a perpetual flute with two spheres, for two trumpeters, one of whom is silent while the other blows, then the one that was blowing falls silent and the one that was silent blows. Also the flautist plays continuously on the pool, [where] there are figures of various types of musicians. I have not described this, but I have described the instrument for the flute, for the earlier [workers] made many mistakes [in its construction].