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An early commercial ECG machine, built in 1911 by the Cambridge Scientific Instrument Company
An early commercial ECG machine, built in 1911 by the Cambridge Scientific Instrument Company
Schema of Einthoven galvanometer, with quartz filament marked a-a'- 1903
Schema of Einthoven galvanometer, with quartz filament marked a-a'- 1903
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An early D'Arsonval galvanometer showing magnet and rotating coil
An early D'Arsonval galvanometer showing magnet and rotating coil
Close-up view (rear) of a permanent magnet type moving coil meter
Close-up view (rear) of a permanent magnet type moving coil meter
Closed-loop galvanometer-driven laser scanning mirror
Closed-loop galvanometer-driven laser scanning mirror
A galvanometer mechanism (center part), used in an automatic exposure unit of an 8 mm film camera, together with a photoresistor (seen in the hole on
A galvanometer mechanism (center part), used in an automatic exposure unit of an 8 mm film camera, together with a photoresistor (seen in the hole on top of the leftpart).