A vernier caliper should be used to measure the diameter of a steel ball.
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it is not possible as i recall
It is not possible to answer the question as given since there is no information as to whether the 140 feet refers to radius, diameter, circumference (or some other measure).
Internal diameter.
The radius of a circle is half the diameter.
There is none. If an accurate measure was possible then statistical techniques would not be required. A maximum likelihood estimate is probably better than other statistical estimates.