238 
Journal of Agricultural Research 
Vol. XXXI, No. 3 
Table V .—American 4-stage, 17-inch pump, No. 5, tested March 20 and March 
28, 1916 
Average 
pump 
speed 
Speed 
of pump 
No. 
of 
run 
Pres¬ 
sure 
head 
Suction 
head 
Static 
head 
Ve¬ 
locity- 
head 
Total 
head 
Brake 
horse¬ 
power 
Dis¬ 
charge 
Water 
horse¬ 
power 
Effi¬ 
ciency 
E. p. TO. 
E. p. TO. 
865 
1 
Ft. 
105.66 
Ft. 
1.46 
Ft. 
11.59 
Ft. 
-0,00 
Ft. 
118.71 
2.60 
G.p.m. 
0 
0.00 
P.ct. 
0.0 
860 
2 
90.96 
2.71 
11.59 
-. 10 
105.16 
11.30 
137 
3.63 
32.1 
856 
3 
81.65 
3.73 
11.59 
-.27 
96.70 
14.02 
225 
5.48 
39.2 
854 
4 
74.23 
4.78 
11.59 
-.50 
90.10 
16.74 
309 
7.02 
41.9 
853 
5 
64.07 
6.98 
11.59 
-1.01 
81.63 
18.57 
435 
8.95 
48.2 
857 
853 
6 
56.96 
8.50 
11.59 
-1.36 
75.69 
18.04 
505 
9.65 
53.4 
854 
7 
47.06 
10.48 
11.59 
-1.86 
67.27 
18.64 
590 
10.02 
53.8 
855 
8 
38.25 
12.29 
11.59 
-2.30 
59.83 
17.65 
657 
9.91 
56.2 
856 
9 
29.15 
14.46 
11.59 
-2.86 
52.34 
15.97 
732 
9.66 
60.4 
857 
10 
20.57 
16.58 
11.59 
-3.34 
45.40 
16.39 
792 
9.06 
55.3 
858 
11 
8.23 
20.28 
11.59 
-4.32 
35.78 
14.91 
900 
8.12 
54.5 
945 
1 
123.85 
1.64 
11.59 
-.00 
137.08 
4.07 
0 
.00 
.0 
940 
2 
111.47 
2.85 
11.59 
-. 12 
125.79 
9.93 
149 
4.72 
47.5 
934 
3 
101.08 
3.98 
11.59 
-.28 
116.37 
15.51 
231 
6.77 
43.6 
933 
4 
92.20 
5.11 
11.59 
-. 55 
108.35 
20.98 
325 
8.87 
42.3 
934 
932 
5 
82.89 
6.92 
11.59 
-1.10 
100.30 
23.01 
455 
11.50 
49.9 
930 
6 
73.18 
8.95 
11.59 
-1.46 
92.26 
24.17 
523 
12.16 
50.3 
931 
7 
62.99 
10.85 
11.59 
-1.90 
83.53 
24.05 
596 
12.55 
52.2 
933 
8 
47.57 
14.12 
11.59 
-2.73 
70.55 
23.66 
716 
12.73 
53.8 
933 
9 
25.14 
19.52 
11.59 
-4.17 
52.08 
22.43 
884 
11.62 
51.7 
935 
10 
8.14 
24.66 
11.59 
-5.47 
38.92 
16.15 
1,012 
9.93 
61.5 
1,090 
1 
183.08 
2.04 
14.57 
-.00 
199.69 
16.55 
0 
.00 
.0 
1,085 
2 
159.44 
2.68 
14.57 
-.06 
176.63 
18.97 
108 
4.81 
25.4 
1,081 
3 
145.15 
3.39 
14.57 
-.21 
162.90 
24.04 
201 
8.25 
34.3 
1,081 
4 
138.14 
4.55 
11.59 
-.43 
153.85 
27.98 
286 
11.09 
39.6 
1,078 
5 
124.20 
6.35 
11.59 
-.91 
141.23 
33.57 
411 
14.63 
43.6 
1,076 
6 
111. 70 
8.76 
11.59 
-1.59 
130.46 
36.14 
536 
17.63 
48.8 
1,079 
1,074 
7 
97.63 
11.48 
11.59 
-2.21 
118.49 
37.31 
644 
19.26 
51.5 
1,075 
8 
83.05 
14.24 
11.59 
-2.95 
105.93 
37.78 
744 
19.89 
52.6 
1,075 
9 
68.93 
17.12 
11.59 
-3.67 
93.97 
37.31 
829 
19.66 
52.6 
1,076 
10 
56.16 
20.02 
11.59 
-4.35 
83.42 
36.11 
903 
19.01 
52.6 
1,078 
11 
43.56 
23.11 
11.59 
-5.12 
73.14 
34.50 
980 
18.09 
52.3 
1,076 
12 
30.17 
26.72 
11.59 
-6.13 
62.35 
33.22 
1,071 
16.85 
50.7 
1,077 
13 
8.70 
29.04 
11.59 
-6.55 
42.78 
32.33 
1,108 
11’. 95 
36.9 
1,186 
1 
220.83 
2.43 
14.57 
-.00 
237.83 
14.28 
0 
.00 
.0 
1,178 
2 
197.67 
2.88 
14.57 
-.04 
215.08 
24.16 
94 
5.09 
21.1 
1,177 
3 
184.32 
3.81 
14.57 
-. 14 
202.56 
28.26 
165 
8.42 
29.8 
1,176 
4 
171.76 
4.24 
14.57 
-.30 
190.27 
32.42 
241 
11.57 
35.7 
1,171 
1,166 
5 
155.24 
5.78 
14.57 
-.72 
174.87 
38.62 
366 
16.15 
41.8 
1,169 
6 
135.95 
8.74 
14.57 
-1.52 
157. 74 
43.57 
534 
21.26 
48.7 
1,164 
7 
119.90 
12.17 
11.59 
-2.38 
141.28 
45.70 
668 
23.81 
52.0 
1,158 
8 
101.46 
15.48 
11.59 
-3.20 
125.33 
46.08 
775 
24.51 
53.1 
1,158 
9 
84.01 
19.07 
11.59 
-4.12 
110.55 
45.67 
878 
24.49 
53.6 
1,163 
10 
65.31 
23.36 
11.59 
-5.22 
95.04 
44.63 
989 
23.72 
53.2 
1,165 
11 
46.08 
27.68 
11.59 
-6.36 
78.99 
43.89 
1,092 
21.77 
49.5 
In order to facilitate the plotting of the performance curves, charac¬ 
teristic curves similar to those shown in Figure 9 were plotted for 
each average speed of pump. The efficiency, total head, speed, brake 
horsepower, and water horsepower were plotted as ordinates, and the 
corresponding discharges in gallons per minute were plotted as 
abscissas from data given in Tables 1 to 7, inclusive. From these 
characteristic curves, the performance curves were produced by 
plotting the capacity-head curves for the various speeds of each pump 
on the same sheet. Points of equal efficiency taken from the charac¬ 
teristic curves were connected so as to form iso-efficiency curves. In 
the same manner points of equal brake horsepower were taken from 
the characteristic curves tod connected to form curves showing 
points of equal brake horsepower. 
