handspan vs mil

handspan

noun
  • The distance between the outstretched tips of the little finger and thumb when used as a unit of measurement 

mil

noun
  • A unit of measurement equal to ¹⁄₁₀₀₀ of an inch (25.4 µm), usually used for thin objects, such as sheets of plastic. 

  • An angular mil, a unit of angular measurement equal to ¹⁄₆₄₀₀ of a complete circle. At 1000 metres one mil subtends about one metre (0.98 m). Also ¹⁄₆₀₀₀ and ¹⁄₆₃₀₀ are used in other countries. 

  • a former subdivision (¹⁄₁₀₀₀) of the Maltese lira 

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