A record changer or autochanger is a device that plays several phonograph records in sequence without user intervention. Record changers first appeared in the late 1920s, and were common until the 1980s. History The record changer with a stepped center spindle design was invented by Eric Waterworth of Hobart, Australia, in 1925. He and his father took it to Sydney, and arranged with a company called Home Recreations to fit it into its forthcoming phonograph, the Salonola. Although this novelty was demonstrated at the 1927 Sydney Royal Easter Show, Home Recreations went into liquidation and the Salonola was never marketed. In 1928, the Waterworths traveled to London, where they sold their patent to the new Symphony Gramophone and Radio Co. Ltd. Eric Waterworth built three prototypes of his invention, one of which was sold to Home Recreations as a model for its proposed Salonola record player as cited above, which is now reportedly in the collection of the Museum of Applied Arts & Sciences in Sydney. The second prototype went to England with Eric and his father, and was sold as part of the deal with the Symphony Gramophone and Radio Company. The fate of this machine is unknown. The third prototype was never fully assembled, and lay in pieces under the Waterworths' house for something like sixty years. After Eric's death, the family found the disassembled parts of the machine and offered them to the Sound Preservation Association of Tasmania. The offer was accepted, and an enthusiastic member began the task of reassembling the prototype. Only a few small parts were found to be missing, and enough remained to finish assembling it and restoring it to a crude working condition. This prototype record changer is now on display at the Sound Preservation Association of Tasmania resource centre in the Hobart suburb of Bellerive. The first commercially successful record changer was the "Automatic Orthophonic" model by the Victor Talking Machine Company, which was launched in the United States in 1927. On a conventional gramophone or phonograph, the limited playing time of 78 rpm gramophone records (averaging a little over four minutes per 12-inch side, and a little over three per 10-inch side) meant that listeners had to get up to change records at regular intervals. The Automatic Orthophonic allowed the listener to load a stack of several records into the machine, which would then be automatically played in sequence for