hourglass vs timeserver

hourglass

noun
  • A cursor, often shaped like an hourglass, indicating that the computer is busy. 

  • A clock made of two glass vessels connected by a narrow passage through which sand flows. 

timeserver

noun
  • A device, node or program that transmits the correct time to clients in a network. 

  • A person who conforms to current opinions, especially for reasons of personal advantage; an opportunist. 

  • Someone who performs a job for the required time only, making a minimum of effort. 

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