10 
BULLETIN 1067, IT. S. DEPARTMENT OF AGRICULTURE. 
1. A 16 by 24 inch automatic noncondensing engine connected by rope drive to a 
rotary chamber-wheel pump. Maximum capacity of 40,000 gallons per minute. 
2. A similar engine connected by rope drive and bevel gear 1 to a 42 by 16 inch 
Menge pump. 
3. A double vertical engine direct-connected to a 36-inch centrifugal pump. 
Pumps 1 and 2 discharge into open flumes at an average head on 
the pump of 10 feet, which was 5 feet greater than necessary. The 
bottom of the discharge flume was placed at the elevation of the top 
of the back levee, which normally was about 5 feet higher than the 
water of the swamp behind the levee. 
In testing pump No. 1, the quantity of water was measured by 
means of a weir without end contractions placed in the discharge 
flume. Table 2 shows the results obtained by the test. 
Table 2. — Test 1 of pump No. 1, Willswood plantation, June 15, 1909. 
Speed. 
Water horse- 
power. 
Boiler 
pres- 
sure. 
Indi- 
cated 
horse- 
power. 
Discharge. 
Actual 
lift. 
Head 
on 
pump. 
Efficiency of 
engine, trans- 
mission, and 
pump. 
Engine. 
Pump. 
Based 
on actu- 
Based 
on head 
al lift. 
pump. 
Lbs . per 
Per 
Per 
sq. in. 
P.p. m. 
P. p.m. 
Sec.-ft. 
G.p. m. 
Feet. 
Feet. 
cent. 
cent. 
89 
153.5 
108.5 
89.0 
78.2 
35, 200 
5.2 
10.0 
46.0 
88.4 
29.9 
57.5 
89 
163.0 
115.0 
94.5 
83.0 
37, 300 
5.3 
10.3 
49.6 
96.5 
30.4 
59.1 
89 
155. 8 
112.5 
92.0 
80.8 
36, 300 
5.4 
10.3 
49.3 
94.0 
31.6 
60.3 
90 
168.8 
116.5 
95.5 
83.9 
37, 700 
5.5 
10.5 
52.1 
99.5 
31.3 
59.8 
92 
166.8 
117.5 
96.0 
84.3 
37,900 
5.5 
10.5 
52.3 
100.0 
31.4 
60.0 
87 
152.2 
109.0 
89.5 
78.7 
35, 400 
5.5 
10.5 
48.8 
93.3 
32.1 
61.3 
86 
145.6 
106.0 
87.0 
76.4 
34, 400 
5.6 
10.5 
48.4 
90.8 
33.2 
2 31. 41 
62.3 
2 60.04 
1 Duration of test, 1 hour and 30 minutes. 
- Average. 
When the pump was credited with the head through which the water 
was elevated at the pump the average efficiency of engine, trans- 
mission, and pump was found to be 60 per cent. Based on the actual 
lift it was only 31 per cent. Assuming the mechanical efficiency 
of the engine as 90 per cent and the efficiency of transmission as 
95 per cent, the efficiency of the pump, if credited with the whole 
lift, is a little more than 70 per cent. 
TEST OF MENGE PUMP, PARADIS, LA. 
Several efficiency tests of Menge pump installations, both for 
drainage and for irrigation, show that where the pumps were favor- 
ably located and the plants in good condition the efficiencies were 
excellent. 
The results given in Table 3 were obtained from a test of a drainage 
plant made at Paradis, La. The plant consisted of a 48 by 18 inch 
Menge pump run by means of a rope drive from a steam engine; 
1 This hassince been changed to a quarter-twist rope drive, thus eliminating the bevel gears. 
