Video
University of Michigan,. (25 July 2014AD) 2014. “Siren Disk Demo – The Musical Scale”. Houghton, Michigan: Michigan Technological University. https://www.youtube.com/watch?v=Hpt2LWgGQwo.
Audio
Scherchen, Herrmann. n.d. “Der Einfluß Des Mikrophons Auf Die Tönende Botschaft - Side B”.
Contributor essay
by
Paolo Brenni

The scientific instruments used for research and teaching in the nineteenth and early twentieth century are beautiful and fascinating artifacts.

Audio
Kolkowski, Aleksander. 2013. “2048 Vps_1876-469_Tone-Limit-Apparatus_1”.
Contributor essay
by
David Pantalony; Erich Weidenhammer; Victoria Fisher

The University of Toronto acoustics collection consists of a comprehensive series of instruments made in the Parisian workshop of Rudolph Koenig (1832