Back in 1969 I had a summer job at a textile mill in the south of Chile. Time was regulated by the loud steam whistles of the three large textile factories that

Back in 1969 I had a summer job at a textile mill in the south of Chile. Time was regulated by the loud steam whistles of the three large textile factories that were the only industry in town. They could be heard throughout the town. A specific sequence (e.g. short-short-long) was the 6 AM wake-up call. There were different sequences for the start of shift, lunch break, etc. It definitely had the feeling of living in a Dickens novel.