An electric battery, consisting of a number of jars joined together in such a manner that they act like a single large jar. The jars are placed side by side in a box or tray lined with tin-foil, which thus unites their outer coatings with each other and with the ground, while their inner coatings are connected by brass rods, joining together the knots of the jars. They are used to accumulate a strong charge of static electricity. The parts of a jar are : TT tin-foil; SS sulphuric acid ;L, leaden rod, with upper part I of iron; W wooden cover, closed by the cork C, to keep out the dust when not in use.