. Bulletin. Agricultural experiment stations -- United States; Agriculture -- United States. 44 Percolation of vaier through different soils. Description of apparatus.—This apparatus (fig. 5), consists of soil tubes similar to those used for the study of the rate of air movement through soils differing only in having tubes at the top by which the series may be connected by pieces of rubTaer tubing and supplied automatically with water so that the head or pressure in all the tubes can be kept constant. The tubes are filled in the same manner with soil as for studying air movements, and the rate
. Bulletin. Agricultural experiment stations -- United States; Agriculture -- United States. 44 Percolation of vaier through different soils. Description of apparatus.—This apparatus (fig. 5), consists of soil tubes similar to those used for the study of the rate of air movement through soils differing only in having tubes at the top by which the series may be connected by pieces of rubTaer tubing and supplied automatically with water so that the head or pressure in all the tubes can be kept constant. The tubes are filled in the same manner with soil as for studying air movements, and the rate of percolation depends upon the same physical properties of the soils as in the case of the movement of air. Details of (he practicum.— 1. Bee that the water supply is properly arranged. 2. Tare the glass or cylinder of each soil tube and record its weight in the jiroper place in a table like the one shown below, but do not return them immediately imder the drain tubes. 3. Remove corks from drain tulies and insert wii-e drips. 4. When water drops from all the wires, place the glasses and cylinders quickly under the drain tubes, noting the Fifj. 5.—Apparatus used to stnriy poroolatioii of water through soils. 5. At the end of 45 minutes quickly remove glasses and cylinders. 6. Remove wire drips and insert corks in drain tubes. 7. Weigh glasses and (cylinders with contents and record weights in the proper place in the table. 8. Make proper computations and introduce results in table. Soil. Number Weight l^ei^^^t of cyhnder.' cylinder : '"J^ms Clay I Clav loam Sandy \ Peat I I Weight of water percolat- ing in minutes. Average percola- tion in 45 minutes. Relative rates of perco- lation. Tons per acre per hour perco- lating. Inches per hour l>erco- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble t
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