Tymbals to be played like the monochord, or the soft flute.

[6] Here there is to be a cylinder of cane after the manner of
clappers with a musical round called a Canon, which is sung in four
parts; each singer singing the whole round. Therefore I here make a
wheel with 4 teeth so that each tooth takes by itself the part of a
singer.

[Footnote: In the original there are some more sketches, to which
the text, from line 6, refers. They are studies for a contrivance
exactly like the cylinder in our musical boxes.]