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Figure 3 Device for measuring the reduced circumference r of an observer falling freely inward along a radius Two objects fall inward with matched speeds along straight radially converging paths A ruler Is attached to one, determine the distance between objects by locating the second object along the ruler Details Make an initial ruler reading as the device passes a spherical shell of known reduced circumference outside the horizon Then assume that the magnitude of a later separation is proportional to the reduced circumference r

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