Tower vs calaboose

Tower

noun
  • Denoting the system of weights used by the Saxon and Norman English kings in their minting of coins. 

name
  • The Tower of London, especially seen as a place of imprisonment or punishment. 

  • A habitational surname.; Alternative form of Towers 

calaboose

noun
  • A prison or jail/gaol. 

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