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Shore Instrument vintage DUROMETER, US $400 – Picture 0
Shore Instrument vintage DUROMETER, US $400 – Picture 0

Shore Instrument Vintage Durometer

US $400

  • Eatontown, New Jersey, United States
  • May 24th
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Durometers measure hardness in elastomers (plastic, rubber....). This one dates to sometime between 1915 and 1950 The Durometer testing technique has it’s origins in instruments used for measuring metal hardness. The Rockwell, Brinell and Vickers type of instruments measure the depth of penetration of a ball or diamond pyramid pressed into the surface under known loads. Inevitably these techniques proved clumsy when applied to softer materials as they measured the indentation in-situ and whilst the indentation is permanent in metal, it is transient in an Elastomer. Paradoxically, there was another metal hardness technique that was a notable exception to the Load Indentation methods previously described. This method recorded the rebound height of a hammer dropped down a tube on to the metal sample and this instrument was called The Shore Scleroscope - it too was unsuitable for measuring rubber hardness (although the self same technique was developed to measure Resilience as the Shore Resiliometer). The Scleroscope was developed around 1908 by the man whose name is synonymous with the Durometer… Albert F. Shore. Albert Shore was born in 1876 and died in 1936. He founded the Shore Instrument Co. Inc., and produced the first quadrant type durometers in 1915. The company was always based in or around the Jamaica area of New York City.

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