100px-Clifford_William_Kingdon

Clifford image

Picture of William Kingdon Clifford, 1901. Frontispiece of Lectures and Essays by the Late William Kingdon Clifford, F.R.S.. This image is in the public domain in the United States as its copyright has expired. Courtesy of Wikimedia Commons: http://en.wikipedia.org/wiki/File:Clifford_William_Kingdon.jpg