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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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After coming to Paris in 1851, Rudolph Koenig trained with the violin maker Vuillaume until 1858, when he launched his own instrument-making business at Place Lycée Louis-le-Grand. Koenig’s workshop participated in Paris’s flourishing activities in scientific research and instrument-making from the 1830s to the 1880s. More specifically, it contributed to the development of acoustics as an independent field of research.

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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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In 1876, the school dropout and trained mechanic Max Hans Robert Kohl founded a workshop for precision mechanics. The company soon grew, and two years later Kohl was already employing nineteen people. He specialized in producing systems and devices for technical and scientific purposes, and supplied laboratories and universities worldwide with his large range of up to 4,000 different products. Dayton Miller, chair of the physics department at Case Western Reserve University, was one of his many clients.