Even with the advent of standardised time, people still struggled to keep their clocks in sync. One London family used this to their advantage and made a living by selling people the time. An astronomer named John Belville would set his pocket watch to the time at the Royal Observatory Greenwich. He would then travel around the city and visit his network of subscribers, who paid to set their clocks by Belville’s pocket watch. After Belville died in 1856, his wife, and then later their daughter Ruth, carried on the tradition. Ruth continued to sell the time until World War II. By then she was in her eighties, and a couple of factors led to her timely retirement: Improved technology had made her role less important, and the war was making treks around London too dangerous.