Electrocardiograph
device · 1903 · Electric age
Recording the electrical activity of the heart (Einthoven).
What it is made of
- Amplifier — has part. Biosignal amplifiers.
Principles and materials it uses
- Copper — is made of. The electrodes and wires are copper.
- Silver — is made of. The quartz string of Einthoven’s galvanometer is silvered.
History: what it evolved from and what it influenced
- Galvanometer — evolved from. Einthoven’s string galvanometer.
- Holter monitor — evolved into. A wearable ECG.
Things built in a similar way
- Electroencephalograph — works like. The same principle of recording biopotentials.