parlor vs sentry-box

parlor

noun
  • A covered open-air patio. 

  • The living room of a house, or a room for entertaining guests; a room for talking; a sitting-room or drawing room 

  • A shed used for milking cattle. 

  • A shop or other business selling goods specified by context. 

sentry-box

noun
  • A booth erected to provide rudimentary shelter to a sentry on his post. 

How often have the words parlor and sentry-box occurred in a corpus of books? (source: Google Ngram Viewer )