Jury rig

So I was having a conversation today and the term "jury rigged" was used, which made me wonder where it comes from. Apparently, it was originally a nautical term having to do with fixing or replacing a ship's mast (https://en.wikipedia.org/wiki/Jury_rig and http://www.worldwidewords.org/qa/qa-jur1.htm) but my initial guess was that it came from rigging a jury so the trial goes your way - you jury rig something so it works the way you want it to, you rig the jury so the trial goes the way you want it to - see the connection? I was wrong, but it makes a good folk etymology. Never would have guessed it came from ships.