As was mentioned in the previous post, Scout notices that the jury members do not look at Tom Robinson before Judge Taylor reads the verdict. According to Scout, a jury never looks at a defendant they have convicted. Atticus more than likely has taught his daughter this simple trick to understanding whether or not a defendant has been convicted before the judge reads the final verdict. One possible reason that the jury members do not look at Tom Robinson is because they feel guilty for convicting an innocent man. During the trial, there was no specific evidence or testimony that clearly indicated that Tom Robinson assaulted or raped Mayella. The jury members allowed their prejudice to sway their opinions and ruled in favor of the despicable Ewell family.
Being the daughter of an attorney in To Kill a Mockingbird, Scout had a little background about juries and how they react. She describes the return of the jury for the Tom Robinson trial as having "a dreamlike quality... moving like underwater swimmers." She saw
... something only a lawyer's child could be expected to see, could be expected to watch for...
A jury never looks at a defendant it has convicted. and when the jury came in, not one of them looked at Tom Robinson.
It was no surprise to her, then, when Judge Taylor polled the jury and received the repeated answers of "guilty." Jem must have been surprised, however, because he "jerked at each guilty" as if he was being stabbed. Scout realized later that Tom had no chance in the first place; the all-white, all-male jury had made up its mind even before the trial had started. For,
... in the secret courts of men's hearts Atticus had no case. Tom was a dead man the moment Mayella Ewell opened her mouth and screamed.