base camp vs installation

base camp

noun
  • An encampment used temporarily for storing supplies and preparing for a larger activity, such as mountain climbing or hunting. 

installation

noun
  • A grouping of facilities that constitute a permanent military base. 

  • Something installed, especially the whole of a system of machines, apparatus, and accessories, when set up and arranged for practical working, as in electric lighting, transmission of power, etc. 

  • An act of installing. 

  • A work of installation art. 

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