cornet vs natural trumpet

cornet

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

  • 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. 

  • 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. 

natural trumpet

noun
  • A valveless brass instrument that is able to play the notes of the harmonic series. 

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