R. G. Hardie & Co. Ltd.; Cranmore Pipe Bags Ltd.
multiple tubular shapes: cylindrical with open distal end; conical with open distal end
airstream from squeezed sack reservoir of pressurized air channeled into air cavity; unidirectional
multiple mechanisms: encased percussion (single) reed; encased concussion (multiple) reed
both none for some components, and opening fingerholes for other components
multiple pitches - both one or more single-pitch tubes, and changing length/shape of standing wave within a single tube with fingerholes
Grinnell College Music Instrument Collection