Tue Aug 05, 2014 10:37 am
Shine a flashlight on the spinning wort and try to see if you can observe any gas evolution taking place in the wort.
Another thing you can check on is to see if the wort smells yeasty (i.e. has been fermenting) or does it smell like fresh cooled wort?
If it has that distinct yeasty smell then the starter is working. If it has that cooled sweet wort aroma then the yeast have not kicked in yet (BTW, this last tip is not foolproof...YMMV).
"A bad man is a good man's job, while a good man is a bad man's teacher."