Friedrich Engels performed research for his book The Condition of the Working Class in England while visiting Manchester, England in 1840.
 This recounts cases seen in the Manchester Royal Infirmary, where industrial accidents dominated and which resonate with Engels's comments on the disfigured persons seen walking round Manchester as a result of such accidents
Upon his return to Britain, Engels re-entered the Manchester company in which his father held shares to support Marx financially as he worked on Das Kapital

