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Stern’s Tone variator, 1897.

Invented by psychologist Wilhelm Stern, the tone variator is an instrument that was devised to test an individual's ability to judge very small differences in pitch. Stern invented this in order to study a person’s sensitivity to ‘change’. This marked a significant shift in the progress of psychophical research as, previously, this research had investigated a person’s sensitivity to differences in constant stimuli.

Image No. 10324862 | This is a Rights Managed image.

Inventory No.: L2001-4002;L2001-4003
Credit © Science Museum / Science & Society Picture Library -- All rights reserved.
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