When designing metal parts, it's important to specify their hardness. However, many engineers have only a shaky understanding of what hardness actually is, or how it's measured. There are good reasons ...

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IN Mr. Mallock's letter (NATURE, Feb. 19, page 276) he states that the periodicity of the hardness he determined does not fit Mendeléef's table. It is interesting to note that the hardnesses, and ...

Unique portable device for the performance of standardized, static ball penetration tests according to Brinell up to a max. load of 29420 N. It is possible to carry out hardness tests on materials and ...