How do bar pool tables differentiate between numbered balls and the cue ball when you scratch?
Coin-op pool tables are designed one of two ways with regard to the cue ball being returned to you: Either the cue ball is slightly larger than the other balls (which allows it to travel down a different chute), or the cue ball has a magnet embedded in it (which trips a sensor to move a gate directing the cue ball down a different chute). It’s much more common to find a coin-op table featuring an oversized cue ball than one with the “magnetic” cue ball.