chiselling vs photogravure

chiselling

noun
  • A piece of work produced using a chisel. 

photogravure

noun
  • A print so made. 

  • An intaglio process for printing photographic reproductions in newspapers and books. 

verb
  • To print by this process. 

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