The effect of pointer width and mark width on the accuracy of visual interpolation

Abstract

In reading dials, how does the size of the pointer, compared to the size of the scale unit, and scale width, effect readability? 10 Ss were exposed to 17 experimental conditions involving differences in viewing distances, pointer position, pointer width, scale mark widths, and interval lengths. "The ratio of pointer width to scale unit width has an effect on the optimal length of interval for interpolation in tenths… . viewing distance might have an effect on optimal interval length." (PsycInfo Database Record (c) 2025 APA, all rights reserved)