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[Contact Clocks]

Metronome with mercury contact

Metronom mit Quecksilberkontakten
  Source   Zimmermann, E. 1923. Liste 33: Über Psychotechnik. Leipzig, Berlin view the source
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ISSN 1866-4784: reference - xlink
 
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Max Planck Institute for the History of Science, Berlin
Institut für Information und Medien, Sprache und Kultur (I:IMSK), Universität Regensburg
Fakultät Medien, Bauhaus-Universität Weimar