Herbert pendulum method

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Herbert pendulum method [′hər·bərt ′pen·jə·ləm ‚meth·əd]

(metallurgy)

Hardness testing in which a 1-millimeter steel or jewel ball resting on the surface to be tested acts as the fulcrum for a 4-kilogram compound pendulum of 10-second period; the swinging of the pendulum causes a rolling indentation in the material, and several hardness factors, such as work hardenability, are determined.

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