I haven’t been able to glean from my Chicago tome how to handle spacing of adjacent quotation marks, as in
I said to Roger, "You really shouldn’t say ‘damn.’ "
How does Chicago handle the spacing between the single and double quotation marks at the end?
Generally, there are no spaces between quotation marks:
I said to Roger, “You really shouldn’t say ‘damn.’”
Occasionally – as in the proofread I finished the other day – I see a hair space inserted between single and double quotes. I kind of like it.
In terms of style, there’s no spacing. In a program which allows for such fine control (e.g., Word Perfect and desktop publishing and typesetting programs), it’s generally wise to allow for extra kerning between nested quotation marks. Where possible, try to introduce other marks of punctuation between them: << “What did you mean by ‘weird’?” she asked. >>
Thanks for the replies.
In our house style, we always put in a “thin space.” I was surprised to see that Chicago doesn’t address this issue directly.
“You really shouldn’t say ‘damn’.” takes care of it. 
My guess is it just didn’t become an issue until folks started displaying fonts like Ariel on CRTs.
“’
'”
I’ll give a nickel to the first person who can tell, just by looking, which of the two above lines is ‘+" and which is "+’.
The need for legibility trumps any rule. So in cases like this one has to do something to make the original intent clear.
Edit: well, that’s interesting. In the edit window there is no visible difference between the two sample lines, but in the thread view the first line is rather obvious. Go figure. Anyway, the bet’s off (I’m such a piker).