cornet vs cornet-à-pistons

cornet

noun
  • A kind of organ stop. 

  • The white headdress worn by the Sisters of Charity. 

  • A pastry shell to be filled with ice-cream, hence (UK, dated) an ice cream cone. 

  • A musical instrument of the brass family, slightly smaller than a trumpet, usually in the musical key of B-flat. 

  • The fifth commissioned officer in a cavalry troop, who carried the colours (equivalent to the ensign in infantry). 

  • A piece of paper twisted to be used as a container. 

cornet-à-pistons

How often have the words cornet and cornet-à-pistons occurred in a corpus of books? (source: Google Ngram Viewer )