Heinrich Geissler

Heinrich Geissler was a German glassblower and scientist in the 19th century, best known for inventing the Geissler tube—an early experimental glass tube used to study electricity. When connected to a high-voltage source, these tubes glowed with colorful electric light, helping scientists explore electrical phenomena before the development of modern devices like neon lights and plasma displays. His work advanced understanding of electrical discharges in gases and contributed to the development of spectroscopy and other fields. Geissler’s innovations played a key role in the scientific exploration of electricity and atomic theory.