Bunsen Cell: Zinc and Carbon in Nitric and Sulphuric Acid (Boy Mechanic, 1913)

A wet cell with high voltage and low internal resistance: a rolled zinc cylinder in dilute sulphuric acid, round an unglazed pot of strong nitric acid holding a carbon. Source: The Boy Mechanic, Book 1 (1913), p. 206. Unknown: carbon size. Picture: the book's cross section and completed cell.