); (3) that cohesion alone acted (
).
The results for various heights of sand in the box are given in [Table 2].
TABLE 2.
| (1) | (2) | (3) | ||
|---|---|---|---|---|
 |  | | | |
| Dry sand | 7 | 0.70 | 0.80 to 0.96 | 26 to 56 |
| Wet sand | 40 | 0.85 | 1.20 " 1.90 | 73 " 133 |
| Very wet sand | 31 | 1.70 | 2.00 " 2.40 | 107 " 226 |
| Fresh earth | 90 | 1.63 | 2.60 " 4.40 | 150 " 242 |
The values of
are given in kilogrammes per square meter. It is seen that suppositions (2) and (3) give discordant results, whereas (1), for each kind of filling, gave identical values of