Flat irons, 18th century. Flat irons such as these were used by laundresses. They were filled with coals or charcoal so as to retain the heat necessary for ironing. (Photo by Museum of London/Heritage Images/Getty Images)
Flat irons, 18th century. Flat irons such as these were used by laundresses. They were filled with coals or charcoal so as to retain the heat necessary for ironing. (Photo by Museum of London/Heritage Images/Getty Images)