Persoz pendulum
A Persoz pendulum is a device used for measuring hardness of materials. The instrument consists of a pendulum which is free to swing on two balls resting on a coated test panel.
A Persoz pendulum is a device used for measuring hardness of materials. The instrument consists of a pendulum which is free to swing on two balls resting on a coated test panel.
A Persoz pendulum is a device used for measuring hardness of materials. The instrument consists of a pendulum which is free to swing on two balls resting on a coated test panel.
Source: Wikipedia "Persoz pendulum" · CC BY-SA 4.0
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