Correction

In an obituary notice reporting the death of Herbert T. Kalmus (Physics Today, September 1963, p. 107), Dr. Kalmus was credited with having invented the Technicolor process used in color motion‐picture photography. We have since been informed that Dr. Kalmus did not invent the process, and that none of the relevant patents are registered in his name. Dr. Kalmus, a physicist, was president from 1915 to 1959 of the Technicolor Corporation, an offshoot of Kalmus, Comstock and Westcott, Inc. He was president of the latter firm from 1912 to 1925, and it was this corporation that carried out the original research and development of the process during the period from 1914 to 1925 under the direction of Daniel F. Comstock. Dr. Kalmus contributed to the success of the enterprise primarily by providing it with sound business direction. Dr. Comstock, who is also a physicist, was a member of the physics faculty at the Massachusetts Institute of Technology from 1904 to 1917 and served as vice president of Kalmus, Comstock and Westcott, Inc., from 1914 to 1925. His name appears as the sole inventor on more than twenty Technicolor patents and in company with collaborators on several other relevant patents. He is president of another research and development company that has been in existence since 1912—Comstock and Westcott, Inc., of Cambridge, Mass.