First page of a paper by P.W. Bridgman in Science 71, 19 (1930). This reprint was a personal copy of Arnold Sommerfeld at the University of Munich and was signed by him in the upper right corner.
First page of a paper by P.W. Bridgman in Science 71, 19 (1930). This reprint was a personal copy of Arnold Sommerfeld at the University of Munich and was signed by him in the upper right corner.