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  • Description: biting
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    • View of a 'quartz fingernail'

    • Testing and Analyzing Finishes
    • A 'quartz fingernail' is used by DuPont chemists to determine how hard a paint film is. The device measures the weight necessary to drive the rounded end of a quartz rod a given distance into the film. In this manner the exact hardness of the paint...
    • DuPont Magazine [October-November 1950]

    • Periodicals; Chemical industry; Plastics industry; Fishing; Firearms industry; Air conditioning industry; Rayon; Textile industry;
    • Table of Contents: A leader among men; The fish are still biting; Log of the Jim Martin; DuPont's new insulating material; Which antifreeze should I buy; The latest in guns; Meet your air-conditioned future; Royalty of the field; Americana by...

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