The Solon iron I mentioned isn't quite as old as yours Ranger, but it dates from the 1950s.

Bill,
The 100/140W Weller guns have, I believe, a two-position trigger switch. If you squeeze it part way in you get 100W; squeeze it further and you'll hear a second click as it notches up to 140W.

My Weller gun must have come from a government surplus batch of some kind, as the lid of the box has "U.S. Government Property" stamped on it. (At least I hope it was govt. surplus -- Don't want the Feds after me! [Linked Image])