Wilhelm Conrad Röntgen and his wife Bertha.

HAPPINESS IN PRIVATE AND PROFESSIONAL LIFE.
On the 19th of January 1872, Röntgen marries Bertha Ludwig in Apeldoorn. They have been a couple since his student days in Zürich. Bertha is the daughter of the university-educated innkeeper in Röntgen‘s favorite pub “The Green Glass”.
During the same year Röntgen follows Kundt to the recently founded State University of Strasbourg. Unlike in Würzburg, the Professorial Council of the Department of Mathematics and Natural Science grants him the right to apply for habilitation in experimental physics after two years of activity as an assistant.