chimney pot vs meerschaum

chimney pot

noun
  • A short earthenware pipe, placed on top of a chimney to improve the draft. 

meerschaum

noun
  • A smoking-pipe made from meerschaum. 

  • A soft white mineral, chiefly used for smoking-pipes and cigar holders. 

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