Originally Posted by Lisnaholic

Well researched, Psy-Fi ! Thanks.

Your second link is clearly the one we need to understand the "Telescopic Bog" story.
(At one time, "I'm going to the bog." was common, acceptable slang in the UK for "I'm going to the bathroom."
In a similar fashion, "Where's the bog?" was not a particularly unusual question, especially among men or boys. Girls, I think, preferred the more genteel slang, "the loo", which comes from the French L'eau. Did French people ask, "Where's the water?" Probably so, back when these things were new.)