title: Analysis of a homemade Edison tinfoil phonograph.
abstract: Thomas Edison's phonograph was a landmark acoustic invention. In this paper, the phonograph is presented as a tool for education in acoustics. A brief history of the phonograph is outlined and an analogous circuit model that describes its dynamic response is discussed. Microphone and scanning laser Doppler vibrometer (SLDV) measurements were made on a homemade phonograph for model validation and inversion for unknown model parameters. SLDV measurements also conclusively illustrate where model assumptions are violated. The model elements which dominate the dynamic response are discussed.
authors.affiliation: Department of Mechanical Engineering and Applied Research Laboratories, The University of Texas at Austin, Austin, Texas 78713-8029, USA. jdsagers@utexas.edu
authors.forename: Jason D
authors.initials: JD
authors.lastname: Sagers
authors.forename: Andrew R
authors.initials: AR
authors.lastname: McNeese
authors.forename: Richard D
authors.initials: RD
authors.lastname: Lenhart
authors.forename: Preston S
authors.initials: PS
authors.lastname: Wilson
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D001296:Audiovisual Aids / Q000266:history; D004867:Equipment Design; D049672:History, 19th Century; D049673:History, 20th Century; D049674:History, 21st Century; D062069:Inventions / Q000266:history; D008962:Models, Theoretical; D009038:Motion; D011312:Pressure; D013016:Sound; D013663:Teaching / Q000266:history / Q000379:methods*; D014001:Tin; D014159:Transducers / Q000266:history; D014732:Vibration
chemical_list: D014001:Tin