What is "aeolian attachment"

AEolian \[AE]*o"li*an\, a. [L. Aeolius, Gr. ?.]

1. Of or pertaining to [AE]olia or [AE]olis, in Asia Minor, colonized by the Greeks, or to its inhabitants; [ae]olic; as, the [AE]olian dialect.

2. Pertaining to [AE]olus, the mythic god of the winds; a["e]rial.

   Viewless forms the [ae]olian organ play.
   --Campbell.

3. relating to or caused by wind.

   [AE]olian attachment, a contrivance often attached to a pianoforte, which prolongs the vibrations, increases the volume of sound, etc., by forcing a stream of air upon the strings.
   --Moore.

   [AE]olian harp, [AE]olian lyre, a musical instrument consisting of a box, on or in which are stretched strings, on which the wind acts to produce the notes; -- usually placed at an open window.
   --Moore.

   [AE]olian mode (Mus.), one of the ancient Greek and early ecclesiastical modes.

n. A device that can be attached to a pianoforte to prolong the vibrations, increase the volume of sound, etc., by forcing a stream of air upon the strings.