Correction
AUG 01, 1971
DOI: 10.1063/1.3043310
June, pages 30–31—The caption for the center photograph should read: “Picnicking on Barton’s farm are Barton, George B. Pegram, John Tate and Madeline Mitchell…” We interchanged the first two names.
© 1971. American Institute of Physics
