. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. Chap, xxi.] THE KYMOGRAPHION. 229 the blood. The oscillations of the mercury tend to «/ maintain themselves, and small variations thus escape record. An arrangement for obtaining tracings with O o o more minute variations is that of Bourdon, adapted by Fick. It consists of a hollow spring thrown into the form of a curve (GB, Fig. 106). The interior is filled with alcohol. One extremity is sealed, and has passing from it an arrangemen
. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. Chap, xxi.] THE KYMOGRAPHION. 229 the blood. The oscillations of the mercury tend to «/ maintain themselves, and small variations thus escape record. An arrangement for obtaining tracings with O o o more minute variations is that of Bourdon, adapted by Fick. It consists of a hollow spring thrown into the form of a curve (GB, Fig. 106). The interior is filled with alcohol. One extremity is sealed, and has passing from it an arrangement of levers GD for amplifying the movement. The extremity of the lever projects, by means of a writing point, against a revolving cylinder. The lower end of the spring communicates with a lead tubing A; which is filled with bicarbonate of soda Fig. 106. — Tick's solution, and is connected with a pblcnf T-shaped tube in the blood- vessel. To damp the oscillations, and prevent them being continued by the mere elasticity of the spring, a prolongation of the writing lever dips below the writing point into a tube of glycerine. Pressure causes the spring to expand, and a movement is communicated to the lever. As soon as the pressure is removed the spring returns to its former position. Marey's tambours (page 185) have been adapted to register blood pressure. In 1861 Marey and Chauveau obtained tracings of pressure by introducing into the heart itself a sort of catheter carrying a small caout- chouc bag at the heart end. The other end of the sound communicated by means of an indiarubber tube with a registering tambour writing on a revolving cylinder. For the right side of the heart the sound was introduced through the jugular vein, for the root of the aorta and left side of the heart through the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may n
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