Jack wędrował po salonie - about?

Zgodnie ze słownikiem PWN-Oxford:
to wander / run about the streets--błąkać się / biegać po ulicach

Dodatkowo: wander about and wander around
to stroll or amble around without any purpose evident; to roam around.

We just wandered about downtown all morning, looking at the shop windows.
It's fun to wander around in a strange town. [1]
1. http://idioms.thefreedictionary.com/wander+about