Two documents, both of which concern illumination studies, are presented. The first is a report on the illumination study at Hawthorne, which began Nov. 24, 1924 and ended April 30, 1927. In this study, candles of various lengths were introduced...
C.E. Turner of Massachusetts Institute of Technology, Dept. of Biology and Public Health wrote G.A. Pennock and M.L. Putnam. The letters discuss testing causes for increased output, analyzing output by 15 minute intervals, testing vascular skin...