Abstract
A JOINT discussion with Section F (Economic Science and Statistics) and the Subsection of Psychology on “The Influence of the Six-hour Day on Industrial Efficiency and Fatigue” was opened by Dr. H. M. Vernon. It has been suggested by Lord Leverhulme that two six-hour shifts may be more economical than one eight-hour shift, because the former would obtain twelve hours' use of expensive machinery instead of only eight hours. Examples were given of cases in which shortening of the hours of labour had increased the output, but in other cases the output had been decreased. The determining factor seems to be the amount of muscular effort put into the work. Heavy muscular work can be speeded up for shorter hours to produce a greater output, but where heavy labour is not involved the production falls with shorter hours.
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