Conversation so far:
What does Lewis have to do with a mathematical analysis of war?
in particular in understanding the basis of international conflict.
Was his mathematical analysis successful?
He also originated the theory that the propensity for war between two nations was a function of the length of their common border.
Did he ever tested his theory?
In Statistics of Deadly Quarrels Richardson presented data on virtually every war from 1815 to 1945.
What else did Richardson do?
As a result, he hypothesized a base 10 logarithmic scale for conflicts.

Question: What does this scale mean?
Self-contained rewrite: What does a base 10 logarithmic scale mean?