lamp vs vacuum tube

lamp

noun
  • A device that generates heat, light or other radiation. Especially an electric light bulb. 

  • A device containing oil, burnt through a wick for illumination; an oil lamp. 

  • A piece of furniture holding one or more electric light sockets. 

verb
  • To hunt at night using a lamp; see lamping. 

  • To make into a table lamp, said of a vase or urn, etc. 

  • To hang out or chill; to do nothing in particular. 

  • To hit, clout, belt, wallop. 

vacuum tube

noun
  • A type of electron tube that controls electron current through vacuum between electrodes within a sealed container, usually of glass or metal and often designed to be easily installed in and removed from the equipment in which it is used. 

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