amanuensis vs typewriter

amanuensis

noun
  • One employed to take dictation, or copy manuscripts. 

  • A clerk, secretary or stenographer, or scribe. 

typewriter

noun
  • A prank in which fingers are jabbed roughly onto someone's chest followed by striking them over the ear in imitation of using an old-fashioned typewriter. 

  • A device, at least partially mechanical, used to print text by pressing keys that cause type to be impressed through an inked ribbon onto paper. 

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