Historical information
Before the introduction of electric irons, various irons were used including flat irons, sad irons, and box irons. These irons were heated on a pre-existing hot surface such as a stove (flat irons, sad irons) or heated internally with a metal slug or hot coals (box irons). Sad irons were heavier than flat irons, as they had a solid block of metal as a base.
Physical description
Cast iron flat iron.