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.
Related Themes and Topics
There are 461 related objects. View all related objects
Magnet constructed from a soft iron core around which is wound a coil of wire. A magnetic field is generated when an electric current is passed through the wire.
An accurate timepiece.
Glossary: chronograph - timer
Timepieces used to register the time of an event or graphically register specific time intervals, such as for the duration of events.