Half-long pipes (plurale tantum)
Bagpipe, mouth-blown: 2 stocks (a: single chanter / b: 3 drones in 1 stock)
With the drones (in 1 stock) resting on [against?] the shoulder; According to Podnos "early pipes of England", also called Gathering pipes; NB (plurale tantum): The term is also used when referring to 1 instrument only.
1st drone: 1 octave below the tonic of the chanter; 2nd drone: 1 octave and a quarter below the tonic; 3rd drone: 2 octaves below the tonic.
Meer, John Henry van der: Typologie der Sackpfeife. In: Anz. Germ. Nationalmus. (Nürnberg, 1964) (Half-long pipe), p.139, 141.
Podnos, Theodor H.: Bagpipes and tunings. Detroit, 1974, p.36.