Cinematic innovators attempted to cope with the fundamental synchronization problem in a variety of ways. An increasing number of motion picture systems relied on gramophone records—known as sound-on-disc technology. The records themselves were often referred to as "Berliner discs", after one of the primary inventors in the field, German-American Emile Berliner. In 1902, Léon Gaumont demonstrated his sound-on-disc Chronophone, involving an electrical connection he had recently patented, to the French Photographic Society. Four years later, Gaumont introduced the Elgéphone, a compressed-air amplification system based on the Auxetophone, developed by British inventors Horace Short and Charles Parsons. Despite high expectations, Gaumont's sound innovations had only limited commercial success. Despite some improvements, they still did not satisfactorily address the three basic issues with sound film and were expensive as well. For some years, American inventor E. E. Norton's Cameraphone was the primary competitor to the Gaumont system (sources differ on whether the Cameraphone was disc- or cylinder-based); it ultimately failed for many of the same reasons that held back the Chronophone.