MOTION IN RELATION TO THE SURFACE FRICTION OF FLUIDS. 
215 
Thus the dimensional equation is 
V" 
L 2 _ 
But according to Newton for similar motion 
Hence 
M 
~v~ 
V 2 " 
-P- 
_L 2 _ 
_L_ 
or 
m 1 
P L.V 
is independent of dimensions. 
The authors also desire to thank Dr. Glazebrook for the facilities given them for 
carrying out the work and the interest he has shown in the progress of the 
experiments. 
Table I.—Observations of Mean and Maximum Velocities. 
Mean velocity, 
centimetres per 
second. 
Observed 
velocity at axis 
(maximum). 
Rate of mean 
velocity to maxi¬ 
mum velocity. 
Nature of flow. 
167-5 
208-8 
0-803 
Water in pipe, 2’855 cm. diameter. 
142-3 
177-5 
0-802 
129-9 
162-0 
0-802 
121-1 
150-9 
0-802 
105-7 
132-4 
0-798 
94-6 
118-4 
0-799 
94-5 
118-6 
0-798 
85-7 
107-4 
0-798 
75-7 
95-0 
0-797 
62-8 
79-0 
0-795 
42-4 
53-7 
0-789 
37-0 
47-1 
0-786 
153-4 
191-4 
0-802 
145-9 
181-2 
0-805 
160-6 
200-0 
0-803 
167-5 
207-8 
0-806 
217-2 
269-4 
0-807 
187-5 
232-8 
0-806 
194-6 
246-7 
0-789 
Water in pipe, 0-7125 cm. diameter. 
145-9 
187-0 
0-780 
125-9 
161-9 
0-778 
104-4 
135-5 
0-770 
81-73 
107-0 
0-764 
65-20 
87-07 
0-748 
