Physiology and biochemistry in modern medicine . Fig. 58. Fig. 59. Fig. 58.— Diagram to show principle of Pilots tubes for measuring velocity pulse. In bothtubes the fluid will rise because of lateral pressure, but in the proximal (left-hand) tube it willrise higher than in the distal, because it will also be affected by the velocity of flow. Fig. 59.—Diagram to illustrate the principle of Cybulskis Photodiematotachometer. The fluidin C stands higher than that in D in proportion to the velocity of flow of the blood Fig. 60.—Dudgeons sphygmograph, (From Jackson.) stream, and records n
Physiology and biochemistry in modern medicine . Fig. 58. Fig. 59. Fig. 58.— Diagram to show principle of Pilots tubes for measuring velocity pulse. In bothtubes the fluid will rise because of lateral pressure, but in the proximal (left-hand) tube it willrise higher than in the distal, because it will also be affected by the velocity of flow. Fig. 59.—Diagram to illustrate the principle of Cybulskis Photodiematotachometer. The fluidin C stands higher than that in D in proportion to the velocity of flow of the blood Fig. 60.—Dudgeons sphygmograph, (From Jackson.) stream, and records not only the lateral pressure but also the pressureproduced by the sudden increase in velocity of the flow, while the 202 THE CIRCULATION OP THE BLOOD other—the distal tube—being bent down stream, records merely lateralpressure. A photographic record of the movement of the fluid in thetwo tubes gives the velocity pulse (see Fig. 58). For physiologic pur-poses the form of apparatus used is constructed as shown in Fig. 59. Palpable Pulse.—To secure a record of the palpable pulse, the so-called sphygmograph is employed, although a tambour having a buttonin the center which is made to press on the artery may also be em-ployed. The commonest form of sphygmograph is that known asDudgeons (Fig. 60). It consists of a small button connected with aspring, the movements of which are transmitted and magnified by meansof a system of levers connected with a writing point arranged so asto inscribe its movements on a moving s
Size: 2004px × 1247px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpubli, booksubjectphysiology
