Playback: 130 year old sounds revealed

Smithsonian, Library of Congress and Lawrence Berkeley National Laboratory Partnership Unlocks Mysteries of History, Science and Invention: Presenting a First Listen to the Experimental Sound Recordings of Alexander Graham Bell

In the early 1880s, three inventors—Alexander Graham Bell, Chichester Bell and Charles Sumner Tainter, collectively making up the Volta Laboratory Associates—brought together their creativity and expertise in a laboratory on Connecticut Avenue in Washington, D.C, to record sound. In one experiment on November 17, 1884, they recorded the word “barometer” on a glass disc with a beam of light. This disc and about 200 other experimental recordings from their laboratory were packed up for safekeeping, given to the Smithsonian and, with a few exceptions, never played again.

In 2011, scholars from three institutions—National Museum of American History Curators Carlene Stephens and Shari Stout, Library of Congress Digital Conversion Specialist Peter Alyea and Lawrence Berkeley National Laboratory Scientists Carl Haber and Earl Cornell—came together in a newly designed preservation laboratory at the Library of Congress to recover sound from those recordings made more than 100 years ago. Using high-resolution digital scans made from the original Volta discs, they were able to hear the word “barometer.”

Playback: 130 year old sounds revealed
The museum’s collection has about 400 of the earliest audio recordings ever made, including the 200 from Bell’s Volta lab. A reflection of the intense competition between Bell, Thomas Edison and Emile Berliner for patents following the invention of the phonograph by Edison in 1877, these recordings, along with supporting documents, were offered to the Smithsonian by each inventor in his lifetime.

“These recordings were made using a variety of methods and materials such as rubber, beeswax, glass, tin foil and brass, as the inventors tried to find a material that would hold sound,” said Stephens. “We don’t know what is recorded, except for a few cryptic inscriptions on some of the discs and cylinders or vague notes on old catalogue cards written by a Smithsonian curator decades ago.”

Now, through a collaborative project with the Library of Congress and Lawrence Berkeley National Laboratory, the mystery of what is on these recordings is being unravelled. To date, the team has successfully submitted six discs—all experimental recordings made by the Volta Laboratory Associates between 1881 and 1885—to the sound recovery process.

The recordings in the museum’s collection are in a fragile condition due to their age and experimental nature. Until now, the technology to listen to the recordings without damaging the discs and cylinders was not available. The non-invasive optical technique used in this project to scan and recover sounds was first studied by Berkeley Lab in 2002–2004 and installed at the Library of Congress in 2006 and 2009. The process creates a high-resolution digital map of the disc or cylinder. This map is then processed to remove evidence of wear or damage (e.g., scratches and skips). Finally, software calculates the motion of a stylus moving through the disc or cylinder ’s grooves, reproducing the audio content and producing a standard digital sound file. For more information, visit

Recovering sound from the six Volta discs is the first step in an on-going project to preserve and catalogue the museum’s early recording collection and to provide increased access to the collection and its contents for both the academic community and the public. The content of the recordings, studied in conjunction with the innovative nature of the physical discs and cylinders, provides insight into a variety of topics—from the invention process of these well-known 19th-century labs to speech patterns of the late 19th century.

Captions and Credits -

1. Photo: Rich Strauss, Smithsonian
Electrotyped copper negative disc of a sound recording,
deposited at the Smithsonian in October 1881 in sealed tin box.

Content: Tone; male voice saying:
“One, two, three, four, five, six”; two more tones

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2. Glass disc recording, produced photographically on
November 17, 1884

Inscription: “Exp. III Nov. 17 1884/Style vibrations to word/
Barometer/H. G. Rogers”

Content: male voice saying: “ba-ro-me-ter”; each syllable is
distinct and the word is repeated

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