VISUAL AND TACTUAL JUDGMENTS OF SURFACE ROUGHNESS

A laboratory experiment; is reported in which skilled and unskilled subjects were required to make comparative judgments of surface roughness, by the use of visual or tactile cues or both, under five different inspection conditions. The small and, in most conditions, insignificant differences between skilled and unskilled subjects, and the effects of changes in the inspection conditions, are discussed in relation to the industrial problem which prompted the investigation