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Barlow, W. H. (1873) 1873. “On The Pneumatic Action Which Accompanies The Articulation Of Sounds By The Human Voice, As Exhibited By A Recording Instrument”. Proceedings Of The Royal Society Of London 22: 277-286.
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Doegen, Wilhelm Albert. 1927. “Wilhelm Doegen Untersucht Die Kupfermatrize Der Stimmaufnahme Hindenburgs”.
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Braguinski, Nikita. 2018. Brüel & Kjær 2304 Level Recorder (Video).
Object, Instrument, Technology

Date of production: 1950s

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“Brüel & Kjær 2304 Level Recorder (1)”. n.d.
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“Brüel & Kjær 2304 Level Recorder (2)”. n.d.
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“Handmade Paper Waterfall Plot: Beethoven’s 8Th Symphony (1)”. n.d.