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The distribution of Arithmetic Average values of s urface roughness across the 120 and 20 microinch patches of NBS Cali-Block " B" have been measured. It is s hown that each distribution can be described in terms of it s mean value and standard deviation. The observed sys tematic di stribution of AA values strongly suggests that the user se lect several widely spaced regions at random on the pat ch when caJibrating a rou ghness measuring instrume nt.

Precision reference specimens of surface roughness: Some characteristics of the cali-block