Einthoven used buckets of electrolyte solution in his initial electrocardiogram (ECG).These have now been replaced by:

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Buckets of electrolyte solution were used to create a conductive pathway between the patient's skin and the recording device. Nowadays, sensors in the form of electrodes are used directly attached to the skin and eliminate the need for the messy and time-consuming setup of the electrolyte solution.

Einthoven Used Buckets of Electrolyte Solution in His Initial Electrocardiogram