In the determination of the indentation hardness of a metal by pressing a ball into its surface, it is shown that the use of a modified procedure that compensates for testing-instrument backlash when measuring indentation depths gives good reproducibility of measurement, approaching the reproducibility found when measuring indentation diameters. This suggests that the need to measure the indentation diameter in the standard Brinell hardness test may be unnecessary, since comparable precision can be obtained by measuring the indentation depth, overall a simpler procedure.
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