Hybrid Union-pipe
Bagpipe, bellows-blown: 2 stocks (a: single chanter / b: 3 drones in 1 stock)
Term used by William A. Cocks for the Pastoral or New bagpipe, an instrument he considered a Scottish adaptation of the Union-pipe [sic].
Baines, Anthony: Bagpipes [1960]. Oxford, 1973 (revised), p.123 (»Cocks, 1954).
Meer, John Henry van der: Typologie der Sackpfeife. In: Anz. Germ. Nationalmus. (Nürnberg, 1964), p.139, 141.
Podnos, Theodor H.: Bagpipes and tunings. Detroit, 1974, p.30 (»Baines).