This stop is mentioned only in passing by Irwin, who says: "... the Bourdon, Nachthorn, Cone Flute, Bass Flute, and other stops can serve as pedal Copulas." Organ builder Guy Henderson describes it as a Spitzflöte of small scale, almost closed at the top, with a taper of 1/7 or more.
All known examples are given below.
Cone Flute 4', Choir; Claremont College, Claremont, California, USA; Estey 1931.
Cone Flute 4', Choir-Swell; Cone Flute 4', Echo; Cone Flute 8', Pedal; Convention Hall, Atlantic City, New Jersey, USA; Midmer-Losh.
Cone Flute 2', Choir; Assembly Hall, Paston School, North Walsham, England; Villiamson & Hyatt 1959.
Cone Flute 4', Great; Trinity Hall, Cambridge, England; Lund 2006?.
Cone Flute 4', Great; First Church of Christ Scientist, La Mesa, California, USA; Pasi c1995.