Plate 8,
1.
A stone roller employed to harden the bottom of the ponds,
2. Loosening of the soil by harrowing,
Trimming the edge of the leaching vat after it had been filled with impregnated soil,
Plate 8,
1.
A stone roller employed to harden the bottom of the ponds,
2. Loosening of the soil by harrowing,
Trimming the edge of the leaching vat after it had been filled with impregnated soil,