Allows user to consult a large number of books without moving or requiring a large table or amount of space. Purportedly useful to those who suffer from gout.
Mechanics: spur gears; epicyclic gear train.
Ramelli, Agostino. “Plate 188: Book Wheel.” In Le Diverse Et Artificiose Machine Del Capitano Agostino Ramelli. Paris, France, 1588. https://digital.sciencehistory.org/works/w6634396g.
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