What sensitive instruments characterized the initial working iteration of the ECG principle?

Answer

string galvanometers

The very first working iteration of the electrocardiogram device relied heavily on a set of sensitive instruments known as string galvanometers. These instruments were crucial for capturing the faint electrical currents produced by the heart. A key operational detail of this early apparatus was that the patient was often connected to as many as five of these galvanometers simultaneously. Furthermore, to achieve the necessary stability for accurate readings, these instruments demanded immersion in water, significantly contributing to the bulk and stationary nature of the entire recording station.

What sensitive instruments characterized the initial working iteration of the ECG principle?
inventiondeviceECGcardiograph