Double sound pendulum
35 x 60 x 18 cm (h x w x d)
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The sound pendulum was originally developed by Christian Heinrich Wolke (1741-1825), who called it the "Akumeter". Together with a pharmacist from Jever, Wolke tried to enable the deaf to hear by means of electrical stimulation. The success of the treatments was to be objectively recorded with the Akumeter.
The invention of the sound pendulum is often attributed to Gustav Theodor Fechner, who wanted to use it to verify Weber's law for the field of hearing.

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Gustav Kafka (1883-1953)
150 x 100 x 2.5 cm (h x w x d)
The Center for the History of Psychology presents:
Maria Schorn (1894-1968)
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Albert Holden Abbott (1871-1934) and presumably Max Wertheimer (1880-1943)
120 x 140 x 2.5 cm (h x w x d)
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Karl and Milly Marbe in the 1930s
120 x 120 x 2.5 cm (h x w x d)
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Carl Jesinghaus (1886-1948)
150 x 100 x 2.5 cm (h x w x d)
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