Factors Influencing Dial Operation

Résumé du livre

Tests devised and conducted by the Psychology Department of the University of New Mexico to obtain data on the frequency of occurrence of errors in reading and setting multiple-turn dials of five different designs are described. Analysis of the data obtained from the tests lead to the conclusion that dial design has marked effect on speed and accuracy with which the dials may be set and read. The design of Dial 5 is recommended for use under the specifications for this study. The set-check system used in the experiments is found to have an error probability of 0.0015 for this dial. A double-set system, in which two persons set two automatically interlocked dials, is suggested and it is predicted that this system would reduce the probability of error for Dial 5 to the order of 0.00003.