Found outside Baghdad, Iraq in 1936, the Baghdad Battery is a small clay jar containing an iron rod suspended in a copper cylinder which is soldered shut and sealed with asphalt.
The containers should be made of dark glass or fired clay. Containers made of iron or copper will ruin fats and oils.
容器应由深色的玻璃或陶瓷做成，因为铁制或铜制的容器会使油脂变质。
3
A flat blade of iron passed beneath it, and lifted it, and tossed it into a cart with other lumps of clay, and it was carried far away, as it seemed, over a rough and stony road.