conn vs take the helm

conn

verb
  • To direct a ship; to superintend the steering of (a vessel); to watch the course of (a vessel) and direct the helmsman how to steer (especially through a channel, etc, rather than steer a compass direction). 

noun
  • The duty of directing a ship, usually used with the verb to have or to take and accompanied by the article "the." 

take the helm

verb
  • To assume responsibility for steering a ship 

  • To take over responsibility (of something) from someone else 

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