Carrier 1 rotates about fixed axis A and is connected by turning pairs B and C to planet gears 3 and 4. Planet gear 3 meshes with fixed sun gear 2 and planet gear 4. The speeds n₁ and n₄ of carrier 1 and gear 4 (in rpm) satisfy the condition n₄=n₁(z₄-z₂)/z₄ where z₂ and z₄ are the numbers of teeth of gears 2 and 4. If gears 2 and 4 are of the same size, we obtain the "Fergusson Paradox" consisting of the fact that gear 4 has simple circular translation about axis A.
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