bar line vs compass

bar line

noun
  • A vertical line in musical notation used to separate two bars or measures. 

  • Synonym of crossline (“type of headline”) 

compass

noun
  • The range of notes of a musical instrument or voice. 

  • A pair of compasses (a device used to draw an arc or circle). 

  • A magnetic or electronic device used to determine the cardinal directions (usually magnetic or true north). 

  • Moderate bounds, limits of truth; moderation; due limits; used with within. 

verb
  • To surround; to encircle; to environ; to stretch round. 

  • To go about or round entirely; to traverse. 

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