Question: Tooth dimension accuracy can be measured with the David Brown tangent comparator, shown in (a), which is a special caliper measuring the length of common

Tooth dimension accuracy can be measured with the David Brown tangent comparator, shown in (a), which is a special caliper measuring the length of common normals, simply illustrated in (b). Prove, the lengths of the common normals between any two opposite involutes are equal, or L1M1 = L2M

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