More on planetary (epicyclic) gearing: you

^More on planetary (epicyclic) gearing: you know how necessity (or laziness) is the mother of invention? here is a man who REALLY loved his books – actually, very much like having multiple tabs open in your web browser: "In 1588, Italian military engineer Agostino Ramelli invented the bookwheel, a vertically-revolving bookstand containing epicyclic gearing with two levels of planetary gears to maintain proper orientation of the books." i want a bookwheel now.^

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