Triple Gear

Saul Schleimer and Henry Segerman
Proceedings of Bridges 2013: Mathematics, Music, Art, Architecture, Culture (2013)
Pages 353–360 Regular Papers


A relatively common sight in graphic designs is a planar arrangement of three gears, all in contact. However, since neighboring gears must rotate in opposite directions, none of the gears can move. We give a non-planar, and non-frozen, arrangement of three linked gears.