polling vs show of hands

polling

noun
  • the process of voting in an election. 

  • The action of taking a poll. 

  • A technique that continually interrogates a peripheral or service to see if it has data to transfer. 

show of hands

noun
  • A vote in which people raise a hand in order to state their agreement with something. 

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