Proving rings are used for load measurements and are used in outfits of a number of Soil / Cement & Bitumen Testing Equipments like Direct Shear Test Apparatus, Triaxil Shear Test Apparatus, C.B.R. Test, Uncontined Test, Marshall Test etc. They are made out of special steel carefully forged to give maximum strength and machined to give highest sensitivity combined with stability to ensure long life and accuracy. When compress or tensile load is applied within the elastic range, the proving rings get temporarily deformed. This deformation is measured by a sensitive dial gauge fixed co-axially at the center of proving ring. The dial gauge readings thus obtained versus load applied enable the operator to find out unknown load, just by noting the dial gauge reading for unknown load. The proving rings have high elasticity and on removing load they regain their original shape provided they are loaded in their elastic limits.
This proving ring is a 7-3/4 in in diameter steel ring with a 4 inch Ames dial that the needle moves easily. This is designed to weigh extremely heavy items such as crane loads and airplanes. Needs to be calibrated, charted and .01 of dial movement would be 10 or 100 pounds. Bronze shackled ends to accept a hook. I believe this to be from the 1940's.....very rare!!
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