There is a telescope on top of the switchboard.
But it is used by that youthener. Go forward with other puzzles and return here later.
This is the low-spoiler guide for "Looking through the telescope" puzzle in The Darkside Detective - A Fumble in the Dark. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.