# Portret van Rudolf Sicco Tjaden Modderman, hoogleraar wis- en natuurkunde in Groningen en rector magnificus van 1881 tot 1882

- By: Friedrich Julius von Kolkow (Danzig, 1839–1914)
- Date: c. 1877 - in or before 1882
- Medium: photographic support
- Classification: page
- Dimensions: height 100 mm x width 63 mm
- Museum: [Rijksmuseum](https://www.rijksmuseum.nl/en/collection/object/RP-F-F25273--fcde51bb2883ebe749a7d9e57427688d)
- Rights: [Public Domain Mark](http://creativecommons.org/publicdomain/mark/1.0/)
- Picture: https://invisiblenetwork.ai/thumbs/web/a8ff6e444d7a4c609b3b969c10f0109c.jpg
- Who can see it: Teens profiles and older (museums give no ratings; placed by Invisible Network from the museum's own words)