We measured the flicker value of officers engaged in coastal steamers and obtained the results as fallows ; 1. Dropping gradient of flicker value of them is more emnient in comparison with that of shore warkers. 2. Daily type of variation of flicker value is abnormal. 3. Flicker value drops eminent at the first day at sea and it likely to degenerate at the third day. 4. Shortage of sleep which comes from shift system of milion load of their quarter must be powerful reason of futigue.
