When a man starts worrying about his heart, he must literally put himself in his doctor's hands. For the diagnosis of heart disease still depends as much on a doctor's manual skill as on his instruments. The doctor feels a patient's pulse, listens to the rhythm of his heartbeat, estimates his blood pressure, measures his heart through X-ray pictures, and records on a graph the electric currents which result from its contraction.
Such detective work is not precise enough for Professor Isaac Starr of the University of Pennsylvania. Says he: "The function of the heart is to pump blood, and an engineer...
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