Continuous Recording of Circulatory Hemoglobin

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Abstract
An electronic method for continuously recording hemoglobin concentration in the blood of experimental animals is described, and the theory, calibration, accuracy, and uses of the apparatus are discussed. The principal value of the apparatus lies in the study of very rapid changes in hemoglobin concentration such as that which occurs following injection of fluid into the blood stream. As little as one‐half cc of saline injected into the vein of an average dog will cause a quantitatively measurable change in the hemoglobin concentration.