https://www.merriam-webster.com/dictionary/proving%20ring
PROVING RING Definition & Meaning - Merriam-Webster
The meaning of PROVING RING is an elastic-shell ring used to calibrate testing machines by means of change in diameter undergone upon application of force...
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https://www.nist.gov/pml/quantum-measurement/mass-and-force/proving-ring/how-did-proving-ring-come-about
How did the Proving Ring Come About | NIST
Jul 23, 2025 - With industrialization gaining momentum in the United States after the Civil War and construction sprouting up everywhere, a need arose f
proving ringcome aboutnist