Phonautograph built by French physicist Leon Scott de Martinville. With a membrane, a bristle and smoke-blackened glass, it demonstrated the vibration of sound waves.
	Phonograph the first talking machine, using a cylindrical record, played back Thomas Edison's historic recording-"Mary had a little lamb ..."
	Disc Record (as distinct from its cylindrical predecessor) produced by Emil Berliner.
	Electrical Recording introduced; 78 r.p.m. turntable speed standardized.
	Long-Playing Record, 12-inch, 33? r.p.m., playing 15 minutes per side, introduced by RCA.
	High Fidelity (then called "higher fidelity"). This was introduced by Decca with FFRR-full frequency range recording.
	Modern LP Record, 12-inch, 33? r.p.m., playing up to 30 minutes per side, introduced by Columbia (U.S.A.).
	Extended-Play Record, 7-inch, 45 r.p.m., introduced by RCA,
	Stereo Records demonstrated by Arnold Sugden at the London Audio Fair.