Unmarked except for a brass plaque (not original) stating that the battery was used by Benjamin Franklin. It contains thirty-five jars in seven rows of five, each jar having a height of 12 1/4" and a 2" square cross-section. Each is covered with foil to a height of about 9", and has a wooden cap from which contact wires project within. Through wires laid across the top, the jars are connected in series. This battery has been restored at some point in the past. Fifteen of the Leyden jars appear to be original; twenty are facsimiles and are so marked by a diamond point inscription on one side. The facsimiles were made in a mold which left a burr not present in the original, and are covered with foil on the outside only. (Robert P. Multhauf, "Catalogue of Instruments and Models," 1961).