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To the Editor:
—The wide field of usefulness suggested by the ingenious clock described by Dr. Joseph B. De Lee in The Journal, March 26, may be considerably increased by its inclusion into the instrumentarium of the well equipped cardiac clinic.Certain modifications in the mechanism of the clock render it peculiarly serviceable in the performing of routine cardiac function tests. In a communication entitled "A Clock for the Cardiac Clinic" (Boston M. & S. J.195: 707 [Oct. 7] I attempted to point out how function tests that utilize pulse frequency ratios may be greatly simplified by this chronometer.Dr. De Lee's clock is too valuable an instrument to remain concealed within the walls of an obstetric operating room, and this note is written merely to call attention to its widespread applicability in other fields of activity, not the least of which is its general use in the study
Hyman AS. TIMING DEVICES IN MEDICAL PRACTICE. JAMA. 1927;88(17):1342. doi:10.1001/jama.1927.02680430044028
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