Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Visual and Verbal Communication (hierarchy name)
4. Information Forms (hierarchy name)
5. information forms (objects)
6. information artifacts
7. [information artifacts by physical form]
8. recordings
9. sound recordings

Anotations

Scope note:

Sound recordings invented by Thomas Edison in 1877. They were the earliest form of phonograph record, and were marketed commercially. Sound would be funnelled through a horn and against a diaphragm, which would vibrate. The resulting vibrations were transmitted to a stylus, which followed a helical path along a surface, usually wax, which coated a rotating cylinder. The resulting cylinder could be played by a cylinder phonograph.