Ironing is the use of a machine, usually a heated tool (an iron), to remove wrinkles from fabric. The heating is around 180–220 °Celsius, depending on the fabric type. Ironing works by loosening the bonds between the long-chain polymer molecules in the fibres of the material. While the molecules are hot, the fibres are straightened by the weight of the iron, and they hold their new shape as they cool. Some fabrics, such as cotton, require the addition of water to loosen the intermolecular bonds. Many modern fabrics developed in or after the mid-twentieth century require little or no ironing. Permanent press clothing was developed to reduce the ironing necessary by combining Wrinkle resistant polymers with cotton. The first known use of the iron for removing wrinkles in clothes is known to have occurred in China, and the electric iron was invented in 1882, by Henry W. Seeley. Seeley patented his "electric flat iron" on June 6, 1882 (U.S. Patent no. 259,054). On 15 February 1858 W. Vandenburg and J. Harvey patented an ironing table that facilitated pressing sleeves and pants legs. A truly portable folding ironing board was first patented in Canada in 1875 by John B. Porter. The invention also included a removable press board used for sleeves. In 1892 Sarah Boone obtained a patent in the United States for improvements to the ironing board, allowing for better quality ironing of shirt sleeves.A domestic item with an interesting history of development, significant as it shows the progress and the evolution of a domestic item designed to make housework more efficient.Wooden Ironing board with press board for sleeves, board is folding.Noneflagstaff hill, warrnambool, shipwrecked-coast, flagstaff-hill-maritime-museum, flagstaff-hill-maritime-village, domestic item, ironing board, ironing, clothes, wrinkles in clothes, henry w. seeley, w. vandenburg and j. harvey