Source: [1], which in turn attributes it to: Zimmermann, E. (1903). XVIII. Preis- Liste über psychologische und physiologische Apparate (p. 119). Leipzig: Eduard Zimmermann
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An illustration of an olfactometer as made by Hendrik Zwaardemaker in 1888. Source: [http://chss.montclair.edu/psychology/museum/x_410.htm], which in turn attributes it to: Zimmermann, E. (1903). ''XVIII. Preis- Liste über psychologische und phy
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