Knocker uppers would stay up all night and often begin waking people up at 3am, says Datta. In a way, they also looked after society, she adds, "in terms of noticing things that seemed off, because they were up and about at hours of the night where other people are sleeping". In 1876, one knocker upper discovered a 2am fire in a Bradford house and awoke the family who were soundly asleep inside, saving their lives. It was also a knocker upper who in 1888 discovered the body of Jack the Ripper's first victim, Mary Nichols.
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