cinematograph vs substratum

cinematograph

noun
  • A camera that could develop its own film and served as its own projector. 

verb
  • To employ the techniques of cinematography. 

substratum

noun
  • A substrate. 

  • The underlying cause or basis of something. 

  • A layer that lies underneath another. 

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