chronograph vs tachograph

chronograph

noun
  • A device which marks or records time or time intervals. 

  • A combination of a watch and a stopwatch. 

verb
  • To make an accurate measurement of the speed of a projectile. 

tachograph

noun
  • A device that records the distance and time traveled by a vehicle (especially a truck or coach), used to check the drivers' working time. 

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