Convert line (button makers) to pica (TeX or Johnson)
Selected category: length.
Definition and details for line (button makers):
U.S. button maker use the "line" unit of length to measure buttons. This unit is equal to 1/40 inch or 0.635 mm. It was probably introduced by German immigrants, who used since ninth century a different version of "ligne" equal to 1/40 inch to measure buttons.
Definition and details for pica (TeX or Johnson):
Johnson pica (pc) is a unit of length approved by the Fifteenth Meeting of the Type Founders Association of the United States in 1886. It is equal to 0.166 inch exactly.