chiselling vs photoengraving

chiselling

noun
  • A piece of work produced using a chisel. 

photoengraving

noun
  • A plate or reproduction made using this process. 

  • A process of transferring a photographic image onto a plate which is then etched and printed. 

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