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Cover image: “Movable Theater Stages,” Scientific American, 5 April 1884, page 1. See the analysis in Joseph A. Sokalski, “Nelson Waldron, Master Stage Machinist of the Nineteenth-Century Theatre,” Nineteenth Century Theatre and Film, 44 (2017), 236-46, and Sokalski, Pictorial Illusionism: The Theatre of Steele MacKaye (Montreal: McGill-Queen’s University Press, 2007).