Terzo (m)
(with) definite article: illow drone, adjustable: conical, straight, bell, no cavity / double reed
Divergent, rear centre.
2 pieces (butt piece + bell); Leydi (1989) gives the pitch of each of the sizes he mentions (17: (b♭¹), 20: (g¹), 23: (f¹), 25: e♭¹, 30: c¹, 32: b♭, 25 bassa: e♭, and 28 bassa: d), but omits to offer an explanation for his use of the brackets.
NB: Example(s) to be replaced with staff-notation.
Leydi, Roberto: La zampogna in Europa. Como, 1979, p.130.
Leydi, Roberto: Typological outlines of the Italian bagpipes. In: SIMP IX (Stockholm, 1989), p.117 (pitches only, no name).