Sounds from the Sprocketorium

Thanks to the tireless efforts of the Hogalum Museum, an extraordinary recording has been unearthed, restored, and digitized for distribution via the internet.  The recording is a copy of an 1874 test of the Electro-Auto-Acousti-Graph-o-Matic conducted by Phineas Magnetron, and is the earliest known recording of its kind.  The estate of Thomas A. Edison has refused comment.