Left: Ritter’s 1800 electrolysis experiment, the measuring cup to catch the escaping gas and certain Ritter’s first time estimate of the ratio of hydrogen gas and oxygen gas right two-to-one. [2] Right: Ritter’s 1801 experiment to investigate the existence of energy beyond the violet end of the visible spectrum. Knowing that photographic paper would turn black more rapidly in blue light than in red light, he exposed the paper to light beyond violet. Sure enough, the paper turned black, proving the existence of ultraviolet light. [3] |