Northumbrian pipes (plurale tantum)
A collective name for the Border or Half-long pipes (also called Halflongs), and Northumbrian smallpipes; According to Manson (p.68), "Both the Irish and the Northumbrian pipes have [...] been elaborated until they have almost ceased to be bagpipes"; NB (plurale tantum): The term is also used when referring to 1 instrument only.
Sachs, Curt: Real-Lexikon der Musikinstrumente: zugleich ein Polyglossar für das gesamte Instrumentengebiet [Berlin, 1913]. Hildesheim, 1964 [facsimile] (➺ Border pipe).
Manson, W.L. [William Laird]: The Highland bagpipe: its history, literature and music, with some account of the traditions, superstitions, and anecdotes relating to the instrument and its tunes (Paisley & London, 1901). Wakefield, 1977 [facsimile], p.168.
Marcuse, Sibyl: Musical instruments: a comprehensive dictionary. New York, 1975 (➺ half long pipe, shuttle pipe, small-pipe, war pipe).