Sargent's apparatuses as displayed by their manufacturer, the Narragansett Machine Company. Hubert Howe Bancroft, The Book of the Fair; an Historical and Descriptive Presentation of the World's Science, Art, and Industry, as Viewed through the Columbian Exposition at Chicago in 1893, vol. 6 (Chicago: Bancroft Company, 1893), 637.

From The body electric: how strange machines built the modern American by Carolyn Thomas de la Peña