82 
Journal of Agricultural Research 
Vol. II, No. 2 
For the purpose of determining the influence on a meter of the vertical 
motion in the water when the vertical integration method is employed, 
experiments were made in Lake Tahoe, Cal., on July 20, 1913. During 
the first 11 runs the meter was operated by the writer's assistant. The 
surface of the lake was smooth and the water exceptionally clear, so that 
the meter could be seen plainly. The particular cup which passed under 
the yoke at the moment of the electrical click was marked, and a definite 
number of round trips were made from the top of a flat rock 2.04 feet 
below the surface to the surface and return. By watching the marked 
cup it was possible to determine the fractional parts of a revolution to 
within probably one-fifth of a revolution. A slight breeze sprang up 
later in the day, and the meter was taken to a protected place where the 
water was clear, 2.28 feet deep, and without a ripple. For the runs made 
in this depth of water the writer operated the meter. 
In order to give a clearer understanding of the plotted results shown in 
figure 4, information in detail of the separate runs is given in Table I. 
Table I .—Indicated velocity of water due to vertical movement of cup fneter in still waters 
of Lake Tahoe, Cal. 
Run 
No. 
Depth of 
water. 
Num¬ 
ber of 
round 
trips. 
Time. 
Num¬ 
ber of 
revolu¬ 
tions. 
Vertical 
move¬ 
ment of 
meter per 
second. 1 
Number 
of revo¬ 
lutions 
per 
second. 
Indicated 
velocity 
of water 
per 
second. 
i 
Feet. 
2.04 
X 
Seconds. 
69*4 
0.0 
Feet 
0.053 
0.000 
Feet . 
0.000 
2 
2.04 
4 
77-0 
4*5 
.191 
• 058 
. 160 
3 
2.04 
4 
60.4 
5-5 
.244 
.091 
• 230 
4 
2.04 
4 
83.8 
5 *o 
* 176 
.060 
. x6o 
S 
2.04 
3 
84-8 
a *3 
.130 
.027 
•095 
6 
2.04 
3 
98.8 
i *7 
. X12 
.017 
.070 
7 
2.04 
3 
X28.6 
x. 2 
.086 
.009 
• 050 
8 
2.04 
5 
48.8 
7*3 
•377 
. 148 
.360 
9 
2.04 
5 
36*4 
8.7 
.506 
•239 
•560 
IO 
2.04 
9 
105* 4 
13 * a 
•314 
•125 
•307 
XX 
2.04 
2 
44 * a 
2.4 
. 167 
•054 
•15a 
13 
2.28 
3 
57 -a 
3*8 
.218 
.067 
.180 
13 
2.28 
3 
40.4 
4*5 
•309 
. in 
.280 
14 
2.28 
3 
40. 2 
4*6 
.311 
.114 
.285 
15 
3.28 
3 
67. 2 
3*6 
. 186 
•054 
.149 
16 
2.28 
2 
61. 2 
2.1 
.136 
•034 
. no 
17 
2.28 
2 
56.6 
a *5 
.147 
.044 
.130 
18 
2.28 
2 
65.8 
2 - X 
. 126 
• 032 
. 101 
19 
2.28 
5 
50-0 
8.5 
.4x6 
.170 
.408 
30 
2.28 
7 
49*0 
12.3 
•594 
• 251 
.585 
21 
2.28 
5 
38. s 
8.7 
•540 
. 226 
•530 
22 
2.28 
7 
37 *o 
12. S 
.788 
.338 
•778 
23 
2. 28 
8 
$a*2 
14.0 
•637 
• 270 
• 625 
24 
3.28 
2 
63*4 
2*5 
•131 
•039 
. 118 
25 
2. 28 
2 
77*8 
2.2 
.107 
.028 
.091 
26 
2.28 
3 
37*4 
4*7 
*334 
. 126 
• 310 
27 
2. 28 
3 
86.2 
3*7 
•I 4 S 
•043 
• 123 
28 
2.28 
4 
88.6 
6.0 
.188 
.068 
.: 80 
1 For one round trip the meter moves 0.4 foot less than twice the measured depth of water. 
The curves plotted to logarithmic scale are based on points whose 
ordinates represent the velocity in feet per second at which the meter 
was drawn through the water (column 6), and the abscissas represent 
the velocity of water indicated by the number of revolutions generated 
1 By "open side of turbine” is meant the side on which the open ends of the cups are upstream. 
