A Differential Vectorcardiograph

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Abstract
A vectorcardiograph was designed and constructed for the purpose of separating and recording the temporal components (P form, QRS form, and T form) of the spatial vectorcardiogram in two planes. The equipment consists of a network to convert the patient voltages into an orthogonal set, a three‐channel low frequency amplifier, a synchronized timing unit, a dual‐beam oscilloscope, a time marker, an electronically operated camera, and a simultaneous direct‐writing recorder.

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