One way to measure the mass moment of inertia of any body relative to its mass center G is...

One way to measure the mass moment of inertia of any body relative to its mass center G is to horizontally suspend it by a string at one end A, and to support it by a scale C at the other end B. The location of points A and B is not important as long as we know the distance d between them and the mass m of the body. When the body is statically supported as described, we take note of the reading on the scale. We then cut the string at A and note the new reading on the scale immediately after the string is cut. Knowing the mass m of the body, the distance d, and the reading on the scale immediately before Nb and after Na the string is cut, determine IG for the body.

Figure P7.53