may be drawn tight or slackened by the lever a b [5].
A drum for harmony [6].
[7] A clapper for harmony; that is, three clappers together.
[9] Just as one and the same drum makes a deep or acute sound according as the parchments are more or less tightened, so these parchments variously tightened on one and the same drum will make various sounds [16].
Keys narrow and close together; (bicchi) far apart; these will be right for the trumpet shown above.
a must enter in the place of the ordinary keys which have the … in the openings of a flute.
1130.
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