Portret van Jacobus Cornelius Kapteijn, hoogleraar wis- en natuurkunde in Groningen en rector magnificus van 1890 tot 1891 before 1891

This photographic portrait, taken by Friedrich Julius von Kolkow, captures Jacobus Cornelius Kapteijn, a professor of mathematics and physics at the University of Groningen. The photograph, dated before 1891, shows Kapteijn in a formal pose, wearing a dark suit and tie. The image is part of a larger album housed at the Rijksmuseum, showcasing the individuals who held the position of Rector Magnificus, the highest administrative office at the university, during the 19th century. The portrait, in a small format, highlights Kapteijn’s scholarly stature and serves as a visual record of his role in the history of the University of Groningen.