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The author describes an instrument for recording the blood pressure, the instrument, including the recording device, being housed in an air-tight metal box. The cuff contains a thin metal layer in the outer wall so as to direct all pressure inward, toward the artery. This cuff is equipped with a metal catch, so that it fits an arm of any size snugly. The "tonoszillogram," or record, that is made depends on two components: (1) the blood pressure proper, depending on the heart's contraction, and (2) the elasticity of the artery wall. Interpretation of the recorded curve was worked out by means of experiments with rubber tubes and tubes of gold beaters' leaf. The didatic notch and Kratham's sounds are discussed. Four phases of the record are described: 1. The compression phase, in which the outer pressure is greater than the maximum pressure plus the "compression pressure," so that the artery
Handbuch der biologischen Arbeitsmethoden.. JAMA. 1932;98(7):576. doi:10.1001/jama.1932.02730330058032