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A fascinating site that sheds light on the early days of experimental psychology is the University of Toronto's Museum of Psychological Instruments. As they write, "In the late nineteenth century, experimental psychologists were intent on modeling their emerging discipline on the natural sciences; psychological instruments and laboratory practice served to legitimize this movement, thereby separating psychology from its traditional parent, philosophy." Photos and reference material on the Horizontal Kymograph, Helmholtz Resonators, the Hipp Chronoscope, and other early brass instruments are exhibited online at the site. Recommended.