S. S. STEVENSâ€™S â€˜LOSTâ€™ PAPER OF 1939: â€œON THE PROBLEM OF SCALES FOR THE MEASUREMENT OF PSYCHOLOGICAL MAGNITUDESâ€
In 1939, S. S. Stevens presented a paper, with the title, â€œOn the problem of scales for the measurement of psychological magnitudes,â€ to the Fifth International Congress for the Unity of Science, in Cambridge, Massachusetts, USA. Stevensâ€™s paper, together with several others delivered at the Congress, was scheduled for publication in Volume 9 of The Journal for Unified Science (Erkenntnis). Copies of those papers were printed for members of the Congress as though they were published, and a few of the papers, including Stevensâ€™s, were so cited later. But The Journal for Unified Science (Erkenntnis) ended with volume 8, volume 9 did not appear, and Stevensâ€™s paper was never published. A copy of Stevensâ€™s paper, as printed for members of the Congress, was found at Harvardâ€™s Psychology Library and is hereby being made more widely available: Nearly 70 years after it was written, Stevensâ€™s paper now appears in these Proceedings.