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Silas Weir Mitchell shown with his sway meter

Silas Weir Mitchell (fifth from right) examining a patient at the Philadelphia Orthopedic Hospital and Infirmary for Nervous Diseases around 1890, surrounded by assistants, house staff, and nurses. Mitchell’s sway meter is shown in the background on the right next to the cabinet and behind both the patient and an observer. (Photograph courtesy of the College of Physicians of Philadelphia.)

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