November 26, 1926
Certificate with text: "The American Physical Society incorporated in the District of Columbia. Dear Sir: I have the honor of informing you that you were elected a member of the American Physical Society at a meeting of the council held in Chicago on November 26, 1926. Respectfully (signed by secretary). To Dr. Linus Pauling, University of Munich, Munich, Germany."
Presented by the American Physical Society.