fraction slash vs shilling mark

fraction slash

noun
  • The slash variant ⟨⁄⟩ used for expressing fractions. 

shilling mark

noun
  • Synonym of slash ⟨/⟩ in its use to mark the amount of shillings in a sum or (obsolete) in all its uses. 

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