The Quantitative Electrokymograph

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Abstract
The quantitative electrokymograph has been developed in an effort to provide an instrument which will be easier to operate than the electrokymographic equipment currently available. In addition, provision has been made for the recording of both border-motion phenomena and densitometric changes within the heart and great vessels. In the design of the instrument, considerable attention has been directed toward the development of a means whereby electrokymographic tracings may be calibrated. Care has also been exercised in the instrument's design in order to provide a frequency response that is essentially flat from 0 to 40 cycles per second.