figure 6.11 pulse measurements, analysis of the task and globe temperatures of an operator of a drop forge. Top heart rate (averaged over 15 min ) Average work pulse during drop forging is 41/min. Middle: distribution in time of the various phases of the job. Pure drop forging occupies 28 per cent of the total time. Globe temperatures for each phase are given in ๐C. Bottom: number of completed units per 15 min period. After Hunting et al. (1974). Globe temperature measures the Mean Radiant Temperature - see Chapter 20 .