ring Co. gives the dimensions and approximate costs of rams
suitable for pumping against a head not greater than about thirty feet
for each foot of fall available in the drive pipe:--

TABLE XI

======+=======================+=======+=========+===============+
| | | | Gallons per |
| Dimensions | Size | Size| Minute |
|-------+-------+-------| of | of| required |
| | | |Drive- | Delivery| to operate |
Number| Height| Length| Width | pipe | -pipe | Engine |
------+-------+-------+-------+-------+---------+---------------+
10 | 2' 1" | 3' 2"| 1' 8"| 1-1/4"| 3/4" | 2-1/2 to 6|
15 | 2' 1" | 3' 4"| 1' 8"| 1-1/2"| 3/4" | 6 to 12|
20 | 2' 3" | 3' 8"| 1' 9"| 2" | 1" | 8 to 18|
25 | 2' 3" | 3' 9"| 1' 9"| 2-1/2"| 1" | 11 to 24|
30 | 2' 7" | 3' 10"| 1' 10"| 3" | 1-1/4" | 15 to 35|
40 | 3' 3" | 4' 4"| 2' 0"| 4" | 2" | 30 to 75|
80 | 7' 4" | 8' 4"| 2' 8"| 8" | 4" |150 to 350|
120 | 8' 9" | 8' 4"| 2' 8"| 12" | 5" |375 to 700|
120 | 8' 9" | 8' 4"| 2' 8"| 2-12" | 6" |750 to 1400|
======+=======+=======+=======+=======+=========+================+

=======+===========+========+========+=======
|Least Feet | |Price |Price
| of Fall | |Single- |Double-
Number |Recommended| Weight |acting |acting
-------+-----------+--------+--------+-------
10 | 3 | 150 | $ 50 | $ 65
15 | 3 | 175 | 55 | 70
20 | 2 | 225 | 60 | 75
25 | 2 | 250 | 66 | 81
30 | 2 | 275 | 75 | 90
40 | 2 | 600 | 150 | 170
80 | 2 | 2200 | 525 | 575
120 | 2 | 3000 | 750 | 850
120 | 2 | 6000 | 1500 | 1700
=======+===========+========+========+=======

If the length of the discharge pipe is more than a hundred feet, the
effect of friction is to reduce the amount of water pumped, but rams
will operate successfully against a head of three or four hundred feet.
The writer remembers an installation in the northern part of New York
State, where two large hydraulic rams furnish the water-supply supply
for an entire village, pumping every day several hundred thousand
gallons. Figure 44 shows an installation