bevel vs fraction bar

bevel

noun
  • An edge that is canted, one that is not a 90-degree angle; a chamfer. 

  • A die used for cheating, having some sides slightly rounded instead of flat. 

  • An instrument consisting of two rules or arms, jointed together at one end, and opening to any angle, for adjusting the surfaces of work to the same or a given inclination; a bevel square. 

verb
  • To give a canted edge to a surface; to chamfer. 

adj
  • Having the slant of a bevel; slanting. 

fraction bar

noun
  • The line separating the numerator from the denominator, whether horizontal, (sometimes proscribed) oblique, or diagonal. 

How often have the words bevel and fraction bar occurred in a corpus of books? (source: Google Ngram Viewer )