This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Rudolf Clausius . Rudolf Clausius Rudolf Clausius Zeitschrift fr Physikalische Chemie Band von Artwork prior or equal Picture taken by Theo Schafgans Bonn heliogravre by Meisenbach Riffarth Co Berlin Scanned image processed and uploaded by Kuebi Armin Kbelbeck Signature vectorized in File Rudolf Clausius signature svg PDold