| Chapter 1: | Water Supplies |
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Table 2. Manual pumping limits data.
| A | B | C | D |
| 10 | 6.0 | 1381 | 20 |
| 15 | 5.5 | 1161 | 25 |
| 20 | 5.0 | 959 | 28 |
| 25 | 4.5 | 777 | 28 |
| 30 | 4.0 | 614 | 27 |
| 35 | 3.5 | 470 | 24 |
| 40 | 3.5 | 470 | 27 |
| 45 | 3.5 | 470 | 31 |
| 50 | 3.0 | 346 | 25 |
| 55 | 3.0 | 346 | 28 |
| 60 | 3.0 | 346 | 30 |
| 65 | 3.0 | 346 | 33 |
| 70 | 2.5 | 240 | 24 |
| 75 | 2.5 | 240 | 26 |
| 80 | 2.5 | 240 | 28 |
| 85 | 2.5 | 240 | 31 |
| 90 | 2.5 | 240 | 33 |
| 95 | 2.0 | 154 | 21 |
| 100 | 2.0 | 154 | 22 |
Source. E. H. Jeynes, “Jeyne’s Corner”. Model Engineer cxliii, no. 3570 (7–20 October 1977), 1117.
Note. A = water lift in feet, B = bore of the pump in inches, C = number of gallons raised in an hour at twenty-five strokes per minute, and D = pressure in pounds that needed to be applied to the pump handle with a leverage ratio of six to one.
would be about 75 feet. From the data in table 2, the pump could have been of 2.5-inch bore, only slightly exceeding the continuous pumping capability of one person, and would have delivered 240 gallons each hour. Supposing the usual complement of the house to have been a family with