fusee vs pilot light

fusee

noun
  • A fuse for an explosive. 

  • A colored flare used as a warning on the railroad. 

  • A light musket or firelock. 

  • A large friction match. 

  • One who, or that which, fuses or is fused; an individual component of a fusion. 

  • A conical, grooved pulley in early clocks, antique watches, and possibly all non-electronic marine chronometers. 

pilot light

noun
  • A small, persistent flame used to ignite gas. 

  • A small telltale lamp on a dynamo or battery circuit whose brightness indicates the voltage of the current. 

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