MOTION IN RELATION TO THE SURFACE FRICTION OF FLUIDS. 
221 
Table II.—Experiments with Water (continued). 
Mean velocity, 
Surface friction, 
centimetres per 
second. 
dynes per square 
centimetre. 
Value of 10 2 . 
pv z 
Value of u ' 10 3 . 
V 
Temperature. 
(*■) 
(R.) 
° C. 
Pipe No. 18. Diameter 0'3G1 cm. (continued). 
2940 
19280 
0-2235 
106-2 
4640 
45000 
0-2090 
167-6 
4920 
49800 
0•2050 
177-4 
4625 
44350 
0-2070 
167-0 
20-5 
4325 
39000 
0-2080 
156-2 
3970 
33500 
0-2120 
143-2 
5606 
61850 
0-1972 
202-5 
596 
1226 
0-346 
17-7 
733 
1746 
0-325 
21 -2 
873 
2353 
0-309 
25-3 
12-0 
994 
2975 
0 • 302 
28-7 
1138 
2352 
0-290 
32-8 
1227 
4260 
0-283 
35-6 
750 
1812 
0-323 
22-0 
1 
602 
1233 
0-341 
17-05 
y 12-5 
603 
1232 
0-339 
17-05 
J 
I 
Table III.—Experiments with Air. 
Mean velocity, 
centimetres per second. 
(v.) 
Surface friction, dynes 
per square centimetre. 
(R.) 
Value of — 10 2 . 
pv- 
Value of — 10 3 . 
V 
Pipe ] 
Vo. 1 . Diameter 2'81 
)5 cm. Temperature 
15° C. 
232-2 
0-335 
0 • 506 
4-48 
252-6 
0-384 
0-491 
4-87 
211-2 
0-281 
0-515 
4-07 
195-8 
0-242 
0-514 
3-78 
186-4 
0-224 
0-525 
3-59 
170-1 
0-183 
0-517 
3-28 
178-5 
0-206 
0-528 
3-44 
278-8 
0-456 
0-482 
5-37 
302-0 
0-524 
0-468 
5-82 
328-0 
0-607 
0-458 
6-32 
346 
0-648 
0-437 
6-67 
274 
0-430 
0-468 
5-29 
478 
1-103 
0-394 
9-21 
404 
0-844 
0-422 
7-78 
488 
1-190 
0-407 
9-41 
353 
0-664 
0-434 
6-81 
