Murdoch Cameron. Photograph by T. & R. Annan & Sons Ltd, 1922. https://www.rawpixel.com/image/13993040/murdoch-cameron-photograph-annan-sons-ltd-1922Free Image from public domain licenseSir William John Ritchie Simpson. Photograph by Douglas Scott. https://www.rawpixel.com/image/13999255/sir-william-john-ritchie-simpson-photograph-douglas-scottFree Image from public domain licenserepro naar geschilderd portret Wilhelm II van R. Grabendorff (1915) by Friedrich Bruckmann https://www.rawpixel.com/image/13756104/photo-image-face-person-artFree Image from public domain licenseMichelangelo Buonarrotti. Photograph by Gustav Schauer after an engraving. https://www.rawpixel.com/image/14005886/michelangelo-buonarrotti-photograph-gustav-schauer-after-engravingFree Image from public domain licenseWilliam Dobinson Halliburton. Photograph by Elliott & Fry. https://www.rawpixel.com/image/13997624/william-dobinson-halliburton-photograph-elliott-fryFree Image from public domain licenseManfred Flückiger. Photograph by Emil Vollenweider, 1900. https://www.rawpixel.com/image/14014252/manfred-fluckiger-photograph-emil-vollenweider-1900Free Image from public domain licenseSouth Africa: Hercules Robinson, Governor of the Cape Colony and High Commissioner of South Africa. 1896. https://www.rawpixel.com/image/14016968/photo-image-face-person-artFree Image from public domain licenseSir Edward Albert Sharpey-Schafer. Photograph by Dr. Pope May, 189-. https://www.rawpixel.com/image/13973735/sir-edward-albert-sharpey-schafer-photograph-dr-pope-may-189Free Image from public domain licenseSir Frederick Gowland Hopkins. Photograph by J. Palmer Clarke. https://www.rawpixel.com/image/13991081/sir-frederick-gowland-hopkins-photograph-palmer-clarkeFree Image from public domain licensePierre Richet (1904-1983). Photograph by L.J. Bruce-Chwatt. https://www.rawpixel.com/image/13956004/pierre-richet-1904-1983-photograph-lj-bruce-chwattFree Image from public domain license