A text-book of physiology . the artery being released, a turn of the stopcocks permits the bloodto enter the proximal end of the long \J tube, along which it courses,driving the fluid out into the artery througli the distal end. Attachedto the tube is a graduated scale, by means of which the velocity with•which the blood flows along the tube may be read off. The Rheometer (Stromuhr) of Ludwig. The principle of thisconsists in measuring the time which it takes the flow through anartery to fill and refill a vessel of known capacity a certain numberof times. The instrument (Fig. 34), which consis
A text-book of physiology . the artery being released, a turn of the stopcocks permits the bloodto enter the proximal end of the long \J tube, along which it courses,driving the fluid out into the artery througli the distal end. Attachedto the tube is a graduated scale, by means of which the velocity with•which the blood flows along the tube may be read off. The Rheometer (Stromuhr) of Ludwig. The principle of thisconsists in measuring the time which it takes the flow through anartery to fill and refill a vessel of known capacity a certain numberof times. The instrument (Fig. 34), which consists of two glass bulbs,one being of known capacity, is connected, like the foregoing in-strument, with two cannulse fixed in the two ends of a severedartery, and is so arranged that the bulb of known capacity can be Chap, iv.] THE VASCULAR MECHANISM. 22^ repeatedly filled and refilled in .succession. From th(3 len<i;tli of timeit takes to fill the bulb a certain number of times the flow through theartery is Fig. 34. Ludwigs Stromuhr and a Diagrammatic kepkesentation of the same. G and H fit into the cannula; placed respectively into the proximal and distalcut ends of the artery under examination. L* is a metal disc revolving on a lowersimilar disc E. A and B are glass bulbs (which can be filled through C) fixed uponD; the capacity of A up to the mark r is known. Holes are bored through D andE in such a way that in the position shewn in the figure fluid passes from Gthrough a and a into J, and so by B, b and h to H. If the disc D be turnedthrough two right angles, fluid passes from a to 6 and so by B, A, and a to b. Ifit be turned through one right angle only the fluid passes directly from G to Bwithout entering the bulbs at all. ^-l is filled with pure oil up to the mark .r, Bwith defibrinated blood. The blood is allowed to flow from G into ^4 until thewhole of the oil is driven into B, the defibrinated blood occupying which is driveninto //. Then, by a rapid t
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Keywords: ., bookautho, bookcentury1800, bookdecade1890, booksubjectphysiology
