attorn vs hand on

attorn

verb
  • To transfer one's obligations from a person to another person. 

  • To consent to the transfer of one's obligations as tenant under a lease to a new landlord. 

  • To acknowledge the jurisdiction of (a particular court) over one's dispute. 

hand on

verb
  • To transfer (something) to someone else, especially as a replacement for oneself (such as an official office or duty); to transfer something that was originally given to oneself from someone else. 

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