. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. 74 PHYSIO LOGIC A L PHYSICS. [Chap. Fig. 41.—Heidenhain's Tetanometer. on a brass column by the axle «. The electro-magnet is connected with the brass support of the arm k. which can be caused to make or break contact with the screw z by moving it with the insulated handle A. The lever hass on its upper surface a steel spring i, bearing a small platinum plate which presses against the platinum point of the screw sy, of the bras
. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. 74 PHYSIO LOGIC A L PHYSICS. [Chap. Fig. 41.—Heidenhain's Tetanometer. on a brass column by the axle «. The electro-magnet is connected with the brass support of the arm k. which can be caused to make or break contact with the screw z by moving it with the insulated handle A. The lever hass on its upper surface a steel spring i, bearing a small platinum plate which presses against the platinum point of the screw sy, of the brass column s. The screw s" regulates the pressure of the platinum plate against the platinum point. The other end of the lever carries a wedge- shaped piece of ivory /<-, with the thin edge downwards, suspended above a little ivory support t, which has a deep groove. This ivory support can be raised up to the lever or lowered from it by the screw sc. To use the apparatus, the limb of a frog is taken, the sciatic nerve is dissected out as long as possible, and laid over the gastrocnemius. The muscles of the thigh are then cleared away, and the femur snipped through below the head. The limb is fixed by the femur in a pair of forceps ; a fine silk thread is tied to the end of the nerve, and by its means the nerve is laid through the notches h' across the groove of the ivory support t, and attached to the ivory axle A. By turning this axle the nerve can be pulled through the notches so as to bring a fresh piece across the groove. One pole of an element is connected to the screw stl and the other to z. The current passes up s to the screw point st along the lever down the column. 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 not perfectly resemble the original M'Gregor-Robertson, J. (Joseph), 1858-1925. Philadelphia, H. C. Lea's son &
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherphila, bookyear1884
