glassichord vs harmonica

glassichord

noun
  • A 19th-century musical instrument made of glass plates that are struck by hammers or sticks. 

  • Synonym of glass harmonica 

  • Anything that produces a similarly pure continuous sound. 

harmonica

noun
  • A toy instrument of strips of glass or metal hung on two tapes, and struck with hammers. 

  • A musical instrument, consisting of a series of hemispherical glasses which, by touching the edges with the dampened finger, give forth the tones. 

  • A musical wind instrument with a series of holes for the player to blow into, each hole producing a different note 

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