Some design factors in making settings on a linear scale

Abstract

Subjects were required to move a pointer by means of a control knob and set it to a position on a linear scale indicated by a lighted insert. Time consumed in making the setting and the relative action potential developed in the active forearm were measured separately for travel to approximated location and for final adjustment. Systematic variations in ratio, knob diameter, backlash and other factors were introduced, using 3 to 5 subjects. Results are given and discussed. (PsycInfo Database Record (c) 2025 APA, all rights reserved)