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"Well," explained Gaines, with just a touch of pride, "you see, for studying blood flow in the extremities, I slip this cuff over my arm, we'll say. Suppose it is the effect of pain I want to study. Just jab that needle in my other arm. Don't mind. It's in the interest of science. See, when I winced then, the plethysmograph recorded it. It smarts a bit and I'm trying to imagine it smarts worse.
Besides, I had read articles about the chronoscope, the plethysmograph, the sphygmograph, and others of the new psychological instruments. Craig carried it off, however, as if he did that sort of thing as an every-day employment.
Without your new plethysmograph, Gaines, you might have thrown it on an innocent person!" "Here's the bullet. What I want you to do, Professor Kennedy, is to catch the crank who fired it." Capt. Lansing Marlowe, head of the new American Shipbuilding Trust, had summoned us in haste to the Belleclaire and had met us in his suite with his daughter Marjorie.
"One of my students is preparing an exhaustive table," went on Gaines, as I had hoped, "showing the effects on blood distribution of different stimuli for instance, cold, heat, chloroform, arenalin, desire, disgust, fear; physical conditions, drugs, emotions all sorts of things can be studied by this plethysmograph which can be set to record blood flow through the brain, the extremities, any part of the body.
Craig had often explained to me how the pressure of the blood was registered most minutely on the dial, showing the varied emotions as keenly as if you had taken a peep into the very mind of the subject. I think the experimental psychologists called the thing a "plethysmograph." Then he had an apparatus which measured association time.
The chronoscope here measures the reaction times and association times in thousandths of a second; the kymograph, by the help of the sphygmograph, writes the record of the pulse and its changes in emotional states, while the pneumograph records the variations of breathing, and the plethysmograph shows the changes in the filling of blood vessels in the limbs which is immediately related to the blood supply of the brain.
There seemed to be a cuff, a glass chamber full of water into which it fitted, tubes and wires that attached various dials and recording instruments to the chamber, and what looked like a chronograph. "That is my new plethysmograph," remarked Gaines, noting with some satisfaction how Kennedy had singled it out. "I've heard the students talk of it," returned Kennedy.
This important and growing department will be represented in the ideal gymnasium of the future First, by courses, if not by a chair, devoted to the apparatus of measurements of human proportions and symmetry, with a kinesological cabinet where young men are instructed in the elements of auscultation, the use of calipers, the sphygmograph, spirometer, plethysmograph, kinesometer to plot graphic curves, compute average errors, and tables of percentile grades and in statistical methods, etc.
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