. Diseases of the heart and thoracic aorta. ckly as the pulsecan be felt with the finger. 5. Its sensitiveness is so great that it records the slightest deviation in form orcharacter of every beat. 6. Its construction is so simple, that if accidentally broken any watchmakercan repair it. 7. It is so small {i^ by 2 inches), and it is so light (4 oz.), that it can easilybe carried in the pocket. 8. It is only one-third of the price of the imperfect and cumbrous instrumentshitherto offered to the profession. 236 Diseases of ilie Heart. DESCRIPTION OF THE SPHYGMOGRAPH. MahouiecVs modification of M
. Diseases of the heart and thoracic aorta. ckly as the pulsecan be felt with the finger. 5. Its sensitiveness is so great that it records the slightest deviation in form orcharacter of every beat. 6. Its construction is so simple, that if accidentally broken any watchmakercan repair it. 7. It is so small {i^ by 2 inches), and it is so light (4 oz.), that it can easilybe carried in the pocket. 8. It is only one-third of the price of the imperfect and cumbrous instrumentshitherto offered to the profession. 236 Diseases of ilie Heart. DESCRIPTION OF THE SPHYGMOGRAPH. MahouiecVs modification of Mareys Sphygniograph consistsof~ I. A steel spring, A (see figs. 60, 61, and 62), which restson the artery, and which moves up and down with eachmovement of the vessel. One end of the spring, A (see figs. 61 and 62), is so attached by ahinge to the framework of the instrument that vertical (up and down)movement is alone permitted. To the under surface of the free end ofthe spring an ivory pad, A, is fixed. The ivory pad rests on the Fig. 60.—?Mahomeds Modification of Alareys Sphygmograph. A, points to the steel spring ; A, to its point of attachment to the framework ; B,the first lever; B, its point of attachment to the steel spring A; C, thewriting lever ; C, its free end, which carries a pen ; C, its point of attach-ment to the framework; D, the screw for bringing the turned up free endof lever B in contact with lever C ; E, the screw for increasing the pressure ;F, the dial on which the amount of pressure is indicated ; G, the slide carry-ing the strip of smoked paper ; H, the clockwork, which is wound up by ascrew on the opposite side to that shown in the figure ; I, I, parts of theinstrument over which the straps, which fix it to the arm, are passed. 2. An arrangement of levers, by means of which the move-ments of the steel spring ( of the artery) are magnifiedand recorded on a piece of smoked paper. There are two levers. The lower one, B, is so hinged by its
Size: 2196px × 1138px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectheart, bookyear1884
