 One of the first scientists to experiment with a Geissler tube was Julius Plücker who systematically described in 1858 the luminescent effects that occurred in a Geissler tube.He also made the important observation that the glow in the tube shifted position when in proximity to an electromagnetic field.Alexandre Edmond Becquerel observed in 1859 that certain substances gave off light when they were placed in a Geissler tube.