calender vs ironstone

calender

noun
  • A machine, used for the purpose of giving cloth, paper etc., a smooth, even, and glossy or glazed surface, by cold or hot pressure, or for watering them and giving them a wavy appearance; it consists of two or more cylinders revolving nearly in contact, with the necessary apparatus for moving and regulating. 

  • One who pursues the business of calendering. 

  • One of a wandering, mendicant Sufic order of fantastically dressed or painted dervishes, founded in the 13th century by an Arab named Yusuf. 

verb
  • To press between rollers for the purpose of making smooth and glossy, or wavy, as woolen and silk stuffs, linens, paper etc., as in a calender. 

ironstone

noun
  • A type of vitreous pottery similar to stoneware 

  • Any ore of iron which is impure through the admixture of silica or clay. 

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