We're at another abandoned lysimetric laboratory.
A lysimeter is a device which measures the amount of actual evapotranspiration released by plants, usually crops or trees. By recording the amount of precipitation that an area receives and the amount lost through the soil, the amount of water lost to evapotranspiration can be calculated.
These are lysimeters.
And one of the galleries adjacent to it.
Each lysimeter is conneted with this device...