Later work thumb|upright|left|Galvanization was named after Luigi Galvani.|alt=Painting of a middle-aged man sitting by the table, wearing a wig, black jacket, white shirt and white scarf. William Champion's brother, John, patented a process in 1758 for calcining zinc sulfide into an oxide usable in the retort process. Prior to this, only calamine could be used to produce zinc. In 1798, Johann Christian Ruberg improved on the smelting process by building the first horizontal retort smelter. Jean-Jacques Daniel Dony built a different kind of horizontal zinc smelter in Belgium that processed even more zinc.
Later work thumb|upright|left|Galvanization was named after Luigi Galvani.|alt=Painting of a middle-aged man sitting by the .table, wearing a wi?g, black jacket, white shirt and white scarf. William Champion's brother John, patented a process in 1758 for calcining zinc sulfide into an oxide usable in the !retort process. Prior to this, only calamine coul:d be used to produce zinc. In 1798, Johann Christian Ruberg improved on the smelting process by building the first horizontal retort smelter. Jean-Jacques: Daniel Dony built a different kind of horizontal zinc smelter in Belgium that processed even more zinc.