Air lifts for water.
Compressed air is also a source of power for raising water from a deep well; but it is neither economical in first cost of apparatus nor in operation. The principle is shown by the diagram of Fig. 23, and explains without words how air pressure may be carried down into the well through one pipe and thereby force the water of the well up into another pipe far above its natural level. The machinery needed involves an engine or motor and an air compressor, the latter taking the place of the ordinary pump. It has the single advantage that it avoids the maintenance of valves and similar deep-well machinery at a great distance below the ground, the air pump not requiring any mechanism in the well.
In Fig. 50 is shown a plant installed by the Knowles Pump Co. for a hotel where the air compressor furnished compressed air to raise the water from the deep well into a tank, whence a steam pump lifts the water to a reservoir, not shown.
Fig. 51.—Wooden tank.
Water tanks.
The standard form of wooden tank in which water may be stored and from which it may be delivered to the house fixtures is pictured in Fig. 51. Figure 52 shows a galvanized iron tank for the same purpose. The tables appended, taken from catalogues of firms building such tanks, show the dimensions, weights, and costs of the two kinds of tanks.
TABLE XV. Dimensions and List Prices of Water Tanks.
Wooden Stave Tanks
| 1-1/2 In. Cypress | 2-In. Cypress | 2-In. Pine | ||||||||
| Length Of Stave, Feet | Dia. Bottom, Feet | Capacity, Gallons | No. of Hoops | Price Galv. Hoops, Extra | Weight Lb. | Price | Weight Lb. | Price | Weight Lb. | Price |
| 2 | 3 | 66 | 2 | $ .30 | 105 | $ 9.30 | 127 | $12.00 | 110 | $10.50 |
| 3 | 3 | 108 | 3 | .40 | 146 | 12.00 | 182 | 15.00 | 157 | 13.20 |
| 2 | 4 | 125 | 2 | .35 | 150 | 14.30 | 186 | 17.50 | 160 | 15.50 |
| 4 | 4 | 283 | 4 | .65 | 260 | 21.00 | 321 | 26.00 | 277 | 23.00 |
| 2 | 5 | 207 | 2 | .45 | 190 | 19.80 | 240 | 24.00 | 207 | 21.00 |
| 2-1/2 | 5 | 272 | 3 | .65 | 247 | 21.30 | 305 | 26.00 | 263 | 23.50 |
| 3 | 5 | 337 | 3 | .65 | 267 | 22.80 | 332 | 28.00 | 287 | 25.00 |
| 4 | 5 | 467 | 4 | .85 | 342 | 25.80 | 425 | 32.50 | 367 | 28.50 |
| 5 | 5 | 597 | 4 | 1.00 | 409 | 28.90 | 508 | 37.00 | 438 | 32.00 |
| 2 | 5-1/2 | 252 | 2 | .50 | 233 | 22.50 | 317 | 27.50 | 251 | 24.00 |
| 2-1/2 | 5-1/2 | 312 | 3 | .75 | 275 | 24.00 | 341 | 31.70 | 294 | 28.00 |
| 2 | 6 | 304 | 2 | .50 | 265 | 23.50 | 331 | 28.00 | 284 | 25.00 |
| 2-1/2 | 6 | 400 | 3 | .75 | 310 | 26.30 | 387 | 31.00 | 334 | 28.00 |
| 4 | 6 | 688 | 4 | 1.25 | 443 | 31.80 | 546 | 41.00 | 473 | 35.00 |
| 5 | 6 | 880 | 4 | 1.40 | 520 | 36.90 | 645 | 48.00 | 557 | 41.00 |
| 6 | 6 | 1072 | 5 | 1.60 | 600 | 42.00 | 744 | 55.00 | 642 | 47.00 |
| 2-1/2 | 7 | 550 | 3 | .85 | 381 | 29.00 | 475 | 38.00 | 409 | 32.00 |
| 5 | 7 | 1210 | 4 | 1.60 | 630 | 45.00 | 780 | 58.00 | 675 | 50.00 |
| 6 | 7 | 1474 | 5 | 2.00 | 738 | 51.50 | 910 | 66.00 | 789 | 56.50 |
| 7 | 7 | 1738 | 6 | 2.35 | 829 | 58.00 | 1028 | 74.00 | 889 | 63.00 |
| 2 | 8 | 551 | 2 | .80 | 408 | 31.00 | 506 | 40.00 | 436 | 35.00 |
| 2-1/2 | 8 | 725 | 3 | 1.20 | 472 | 35.00 | 587 | 45.00 | 507 | 39.00 |
| 6 | 8 | 1943 | 5 | 2.60 | 880 | 61.00 | 1083 | 78.00 | 938 | 68.00 |
| 8 | 8 | 2639 | 7 | 3.50 | 1113 | 76.00 | 1363 | 97.00 | 1193 | 84.00 |
| 9 | 9 | 3825 | 8 | 5.20 | 1770 | 124.40 | 1539 | 108.00 | ||
| 6 | 10 | 3093 | 5 | 4.30 | 1458 | 107.00 | 1266 | 91.00 | ||
| 8 | 10 | 4200 | 7 | 6.20 | 1867 | 131.00 | 1630 | 113.00 | ||
| 10 | 10 | 5308 | 9 | 8.10 | 2277 | 155.00 | 1994 | 135.00 | ||
| 12 | 10 | 6516 | 11 | 10.00 | 2653 | 179.00 | 2323 | 157.00 | ||
| 6 | 12 | 4494 | 5 | 6.30 | 1930 | 138.00 | 1685 | 120.00 | ||
| 10 | 12 | 7714 | 9 | 11.35 | 2910 | 200.00 | 2555 | 174.00 | ||
| 12 | 12 | 9324 | 11 | 14.00 | 3393 | 231.00 | 2984 | 201.00 | ||