The bottom of the cylinder was capped with a crimped-in copper disk and sealed with bitumen or asphalt.
At the top, the iron rod is isolated from the copper by bitumen plugs or stoppers, and both rod and cylinder fit snugly inside the opening of the jar, which bulges outward towards the middle.
The copper cylinder is not watertight, so if the jar was filled with a liquid containing citric acid, this would surround the iron rod as well.
The Baghdad Battery, sometimes referred to as the Parthian Battery, is the common name for a number of artifacts created in Mesopotamia, possibly during the Parthian or Sassanid period (the early centuries AD).
In 1940, König published a paper speculating that they may have been galvanic cells, perhaps used for electroplating gold onto silver objects.
In 1940, Knig published a paper speculating that they may have been galvanic cells, perhaps used for electroplating gold onto silver objects.
This interpretation continues to be considered as at least a hypothetical possibility.
If correct, the artifacts would predate Alessandro Volta's 1800 invention of the electrochemical cell by more than a millennium.
Description and dating The artifacts consist of terracotta jars approximately 130 mm (5 in) tall (with a one and a half inch mouth) containing a copper cylinder made of a rolled-up copper sheet, which houses a single iron rod.
After Mike Mikesell had ruined a diamond saw blade in cutting it open, the geode proved to contain something strange.