Progress in the production and application of light

For at least three decades, light sources and their application continuously have undergone rapid changes. To provide the Institute membership with a record of these developments, it has been the policy of the AIEE committee on the production and application of light to prepare at periodic intervals reports reviewing the progress achieved during those intervals. The 1939–40 committee^∗ presents in this report a summary of the epoch-making advancements since 1936, when the last previous report was published,¹ prepared by a member and former chairman of the committee.