 A tendency to use single quotation marks in British writing is thought to have arisen after the invention of steam-powered presses in the mid-19th century and the consequent rise of London and New York as very separate industrialized printing centres with distinct norms.However, "The King's English" in 1908 noted that the prevailing British practice was to use double marks for most purposes, and single ones for quotations within quotations.Different media now follow different conventions in the United Kingdom.