In the days before electric lighting, working hours were determined by the length of the day. Candlelight made for tired eyes and people’s schedules largely followed that of the sun. Theaters and train cars were dark in the era before ours, when bright smartphone screens are both a help and a nuisance. It was in this earlier age that the repeater watch was created so a man could check the time in the dark.
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https://gearpatrol.com/2020/06/12/how-repeater-watches-work/
