The British Parliament took on a series of initiatives to investigate the lives of women and children in the mid-nineteenth century, and the resulting testimonies, presented by workers to the various parliamentary commissions make for fascinating—and uniquely visceral—reading. The lives of working children are rarely detailed in historical sources from any era, but these testimonies had a direct impact, if not a fully humane one, on the lives of British laborers. These documents were collected for Lord Ashley’s Mines Commission of 1842, and the shocking testimony resulted in the Mines Act of 1842, which prohibited the employment in the mines of all females and of boys under 13 years of age.
http://www.victorianweb.org/history/ashley.html, from Readings in European History Since 1814, ed. Jonathan F. Scott and Alexander Baltzly (New York: Appleton-Century-Crofts, 1930), drawing on Parliamentary Papers, 1842, vols. 25–27, Appendix 1, 252, 258, 439, 461; Appendix 2, 107, 122, 205.