Etymology
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cardiograph (n.)

"apparatus for recording by tracing the beating of the heart," 1867, from cardio- + -graph "something written."

Although the work does not treat of the recent means of diagnosis—the thermometer, laryngoscope, cardiograph, etc.,—still it is complete as far as it goes. [book review in Medical Investigator, May 1867, p.94]

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Definitions of cardiograph

cardiograph (n.)
medical instrument that records electric currents associated with contractions of the heart;
Synonyms: electrocardiograph
cardiograph (n.)
a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles;
Synonyms: ballistocardiograph
From wordnet.princeton.edu