When tracing point A is moved along curve a, sliding link 1 moves in sleeve 2. This turns link 3 about axis C and gear 4 turns about axis B, thereby turning gear 5. The angle of rotation of recording wheel 6 is proportional to the quantity ∫(sqrt(r₀-r))dϕ, where r₀ is the radius of the largest circle that can be described by point A.
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