1107 
In fig. 25 f(C) has been represented graphically for several 
Values of B; C has been set out in vertical direction, f each time 
from the C-line in horizontal direction (viz. parallel to the B-axis). 
The most outward broken line gives the value f— ca. 0,01. The 
“opposite” values of f occur for small values of C between 
== 1 and B ca. 3: 
In fig. 26 these distribution curves are given along the circum- 
ference of the cylinder and along the z-axis behind it. Here k/a 
has been taken equal to 0,000625, i.e. A= 3200, though this 
makes the boundary layer already too thick to allow the appro- 
ximation. The thick lines indicate the distribution of the velocity 
for the same values of B. The region of negative velocities extends 
from B= 1 till beyond 6—5; the limit has not been calculated, 
as the determination of the integrals by means of the planimeter has 
not been made with sufficient accurateness thereto. 
Fig. 27 gives a sketch of the vortex region and of the stream 
lines of the relative flow. 
Fig. 28 is a sketch of the dimensions of the vortex region for 
R= 80000 = 25 3200; the values of «a (and therefore the 
thickness of the layer) are then divided by 5. 
VI. When we use the complete equation (21) in stead of (22), (/) 
is replaced by an expression with a Besselianfunction under the 
sign of integration: (see the quoted paper of L. V. Kine). 
