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The mean value of the radius r may be found most suitably by introducing a thread of mercury into the tube either before or after the main experiment and measuring the length of this thread. Suppose this is 1', then the mass of the thread of mercury is pr 21'r', where r' is the density of mercury. If the thread of mercury is emptied out into a weighed receiver its mass may be determined and so r found assuming the value of r' is known. 3) may then be used to find the value of h. 3. 4) F = 6tthrn, where h is the viscosity coefficient of the medium.

COURSES of flow is sufficiently low for the flow to be laminar. 3) where p is the difference in the pressure in the liquid at the two ends of the tube. V is in m3 if r and 1 are in m, h in kg m -1 s-1, p in N m-2 and t in sec. This is Poiseuille's equation, ~1 ))) 0 FIG. 2. the derivation of which is somewhat too lengthy to be included here. S. unit of h (the poise) was named. He was responsible for much research in the field of viscous flow through tubes and first derived eqn. 3). 3 illustrates a suitable experimental arrangement for the measurement of h for a liquid by the use of eqn.

2. The liquid against the wall of the tube remains at rest while the liquid flows with maximum velocity along the axis. C. COURSES of flow is sufficiently low for the flow to be laminar. 3) where p is the difference in the pressure in the liquid at the two ends of the tube. V is in m3 if r and 1 are in m, h in kg m -1 s-1, p in N m-2 and t in sec. This is Poiseuille's equation, ~1 ))) 0 FIG. 2. the derivation of which is somewhat too lengthy to be included here. S. unit of h (the poise) was named.

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