Slide block 2 slides along stationary guide p-p and is connected by turning pair B to arm 1 which mounts recording wheel 3 turning about axis c-c. When tracing point E is moved along curve y = f(x), arm 1 turns about point B and simultaneously slides by means of slide block 2 along axis x-x. Angle ϕ of rotation of recording wheel 3 is proportional to the integral of the curve f(x).
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