Great men of science

A history of scientific progress

By Philipp Lenard, formerly Professor of Physics and Director of the Radiological Institute in the University of Heidelberg, Nobel Laureate, Rumford Medallist of the Royal Society of London, Franklin Medallist of the Franklin Institute of Philadelphia. Translated from the second German edition by Dr. H. Stafford Hatfield, with a preface by E. N. da C. Andrade, Quain Professor of Physics in the University of London