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Braguinski, Nikita. 2018. Random Noise Generator Type 1390-B (Video).
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Braguinski, Nikita. 2018. Brüel & Kjær 2304 Level Recorder (Video).
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Image Source: Dresdner, Albert: Industrielle Vertreter der Industrie und des Handels in Wort und Bild, Berlin, 1899.

1853
1908
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Turner, Steven. 2012. “Introduction To Tuning Forks From The National Museum Of American History”. Smithsonian National Museum of American History. https://youtu.be/arP0Jq35dws.
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2012. “Demonstration Acoustic Siren”. Smithsonian National Museum of American History. https://www.youtube.com/watch?v=Rs7CC4pdJeM.
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2012. “Rotator Siren”. Smithsonian Institution. https://www.youtube.com/watch?v=hzoelA3Pm8E.
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Fondazione Scienza e Tecnica,. (17 August 2015AD) 2015. “Manometric Capsule, Resonance, Koenig Sound Analyzer”. Florence, Italy: Fondazione Scienza e Tecnica. https://www.youtube.com/watch?v=OHdL-65dkkY.
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Fondazione Scienza e Tecnica,. (17 August 2015AD) 2015. “Recording The Vibrations Of Tuning Forks”. Florence, Italy: Fondazione Scienza e Tecnica. https://www.youtube.com/watch?v=o7A4jyFG7hE.
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Sabine was a pioneer of architectural acoustics. He defined the reverberation time and empirically developed its formula, which helped him to predict and optimize the acoustics of large auditoriums such as the Fogg Lecture Hall at Harvard and the Symphony Hall in Boston.

1868
1919