Dutch physicist Pieter Zeeman was born #OTD in 1865.
In 1896, while studying the effect of magnetic fields on the light emitted by a sodium flame, Zeeman observed that the spectral lines of the light split into multiple components in the presence of a magnetic field- the Zeeman effect.
In 1902, Pieter Zeeman was awarded the Nobel Prize in Physics, shared with Hendrik Lorentz, for the discovery of the Zeeman effect and its theoretical explanation.
INTERIOR OF THE PHYSICAL LABORATORY AT PASADENA Showing slit end of vertical spectrograph and magnet used in study of Zeeman effect. Electric arcs, electric furnaces, pressure pumps, and electro-magnets are available for spectroscopic studies. via @interarchivehttps://archive.org/details/reviewofreviewsw42newy/page/202/mode/1up?view=theater