Dr. Donald Slaughter studies the output of a physiological process on a kymograph, which consists of a revolving drum wrapped in a sheet of paper on which a stylus moves back and forth.
Title
Donald H. Slaughter, M.D. observes results on kymograph
At the time this photo was taken, kymograph paper was covered in charcoal, which is why the paper looks black except where the stylus has touched it. The primary use of a kymograph was to measure physiological processes.
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