Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Sound Devices (hierarchy name)
5. sound devices (equipment)
6. [sound devices by acoustical characteristics]
7. aerophones
8. flutes (aerophones)
9. duct flutes
10. whistles

Anotations

Scope note:

Whistles that are attached to barrel-operated, steam calliopes. The volume of calliope whistles dictates their pitch. Calliope whistles may also be detached from the instruments, and historically were sometimes placed on trains or ships as steam whistles.