954 
MR. 0. REYNOLDS ON THE MOTION OF WATER AND OF 
Table I. 
Experiments with Colour Bands—Critical Velocities at which Steady Motion 
breaks down. 
Pipe No. 1, glass.—Diameter 0'0268 metre; log diameter 2'42828. 
„ No. 2, „ „ 0-01527 „ „ 2-18400. 
„ No. 3, „ „ 0-00788G „ „ 3-89783. 
Discharge, cub. metre = "021237 ; log =2*32709. 
Date, 1880. 
Reference 
Number. 
Pipe. 
Temperature, 
centigrade. 
Time of 
discharge. 
Velocity, 
metres. 
log time. 
-log P. 
log Y. 
log B.. 
1 March 
1 
No. 1. 
8-3 
60 
0-6270 
1-77815 
0-11242 
T79729 
1-66200 
3 „ 
2 
59 
21 
87 
0-4325 
1-93959 
C-25654 
1-63593 
1-67930 
25 ,, 
3 
55 
15 
70 
0-5374 
1-84500 
0-19198 
1-73035 
1-64936 
21 April 
4 
55 
12 
60 
0-6270 
1-77815 
0-15712 
1-79729 
1-61730 
5 
5 9 
13 
64 
0-5878 
1-80618 
0-16882 
1-76926 
1-64464 
95 
6 
59 
13 
67 
0-5614 
1-82617 
0-16882 
1-74927 
1-65363 
95 
7 
55 
13 
64 
0-5878 
1-80618 
0-16882 
1-76926 
1-64464 
55 
8 
59 
5 
54 
0-6967 
1-73239 
0-06963 
1-84305 
1-65898 
95 
9 
55 
5 
52 
0-7235 
1-71600 
0-06963 
1-85940 
1-64269 
22 „ 
10 
55 
10 
62 
0-6068 
1-79239 
0-13319 
1-78305 
L65546 
59 
11 
55 
11 
64 
0-5870 
1-80613 
0-14525 
1-76931 
1-65716 
25 March 
12 
No. 2. 
22 
155 
0-7476 
2-19033 
0-26710 
1-87367 
1-67523 
23 April 
13 
59 
11 
110 
1-052 
2-04139 
0-14525 
0-02261 
1-64814 
99 
14 
55 
11 
108 
1-072 
2-03342 
0-14525 
0-03058 
1-64017 
55 
15 
55 
4 
83 
1-396 
1-91907 
0-05621 
0-14493 
1-61486 
,, 
16 
59 
4 
83 
1-396 
1-91907 
0-05621 
0-14493 
1-61486 
59 
17 
55 
4 
83 
1-396 
1-91907 
0-05621 
0-14493 
1-61486 
55 
18 
59 
6 
86 
1-348 
1-93449 
0-08278 
0-12951 
1-59371 
55 
19 
95 
6 
85 
1-362 
1-92941 
0-08278 
0-13459 
1-59863 
24 „ 
20 
No. 3. 
11 
220 
1-967 
2-34242 
0-14525 
0-29392 
1-66300 
55 
21 
55 
10-5 
224 
1-932 
2-35024 
0-13920 
0-28610 
1-67687 
55 
22 
99 
11 
218 
1-982 
2-33845 
0-14525 
0-29789 
1-65903 
,, 
23 
95 
11 
116 
2-004 
2-33445 
0-14525 
0-30189 
1-65503 
25 „ 
24 
,, 
4 
164 
2-637 
2-21484 
0-05621 
0-42150 
1-62446 
95 
25 
95 
4 
172 
2-517 
2-23552 
0-05621 
0-40082 
1-64514 
55 
26 
55 
6 
176 
2-460 
2-24551 
0-08278 
0-39083 
1-62856 
95 
27 
59 
6 
176 
2-460 
2-24551 
0-08278 
0-39083 
1-62856 
99 
28 
55 
6 
174 
2-488 
2-24054 
0-08278 
0-39580 
1-62359 
59 
29 
59 
6 
177 
2-446 
2-24791 
0-08278 
0-38837 
1-63102 
This gives the mean value for log B v 1 "64139 ; and B t =43"79. 
