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d'Arsonval electric chronometer, Paris, France, 1902

Science Museum, London


Free to use with attribution CC BYCredit: Science Museum, London
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This chronometer has been adapted to record the response time of a nerve to a stimulus. The patient is touched with the ball-topped metal rod, which has been charged by an electromagnet. Once they have felt the current, they press down on the tweezers-like rod in their hand. This cuts the current and holds the needle on the dial in place so a reading in hundredths of a second can be taken. This chronometer was invented by Jacques-Arsène d'Arsonval (1851-1940), a biophysicist. His chronometer could determine the extent and location of damage to the nervous system, as injured nerves took longer to transmit stimuli. maker: Verdin, Charles Place made: Paris, Ville de Paris, Île-de-France, France


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d'Arsonval electric chronometer, Paris, France, 1902. Credit: Science Museum, London. CC BY

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