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was dug into the peat, then lined with tarred timber stakes around the sides. Into this pit was placed a porous earthenware vessel, surrounded by crushed limestone. The interior was filled with coke around a graphite anode. Nitric acid was pumped out via a glass tube that was sunk down nearly to the bottom of the pot, while fresh water was pumped into the top through another glass pipe to replace the fluid removed. Cast iron cathodes were sunk into the peat surrounding it. Resistance was about 3 ohms per

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