ARTICLE SYNOPSIS ...She flashes signals from the pit at CBT by Phyllis Brock At precisely 8:00 a.m. Central Time a buzzer sounds and the financial floor of the Chicago Board of Trade (CBT) bursts into life. Runners scurry about carrying messages between traders, brokers and clerks. A crescendo of sound rises and falls as voices blend into an incomprehensible roar. Accompanying the roar, raised hands flash a blur of signals. People wearing brightly colored jackets and large badges for identification swirl about. Another day of trading has begun. Shouting at the top of her lungs to attract the attention of a tele...