Search Only Images Download this image Portrait of Hermann von Helmholtz No info available for book source. Image ID: SIL-SIL14-h003-06 Supplied Caption: Portrait of Hermann von Helmholtz. Relief halftone by Charles Henry Jeens, 1827-1876.Reproduction of an engraving by Jeens, from a photograph. Original Caption: Reproduction of an engraving by Jeens, from a photograph. Tags: physics, Helmholtz, Hermann von (1821-1894) Categories: Science Collection(s): Scientific Identity No Copyright - United States Request copy of image How can I use this image?