Siesieńki dwukomorowe (f [?]) (plurale tantum)
A Siesieńki with 2 bladders; Wielkopolska [Greater Poland]; This rare type has a blowpipe with mouthpiece and valve inserted in the upper bladder; the lower bladder contains the chanter stock; The 2 bladders are connected by a tube that is open at its upper end (inside the upper bladder) and provided with a non-return inlet valve at its lower end (inside the lower bladder).
Sobiescy, Jadwiga [Pietruszyńska] & Marian: Polska muzyka ludowa i jej problemy [Polish folk music and its problems]. Wybór prac pod redakcją Ludwika Bielawskiego [A selection of their works edited by Ludwik Bielawski]. Warszawa, 1973, p.140/*.