"grease Monkey" "rule of thumb"

Posted by Kevin on November 13, 2001

I am trying to find out the meaning and origin of the phrases "grease monkey" and "rule of thumb" I am using them in a current paper for my masters degree so I need credible sources. Can anyone help?

• "Grease monkey" ESC 11/14/01
  • Rule of thumb ESC 11/14/01
    • Rule of thumb R. Berg 11/14/01