Roulette dealers get into a rhythm. They pick up the ball from the pocket where it last hit the same way each time. They then spin it the same way each time, with the same force. Thus, the ball will spin the same number of spins and should land the same number of pockets away from the last spin. This unconscious ability or trait to place the ball, not so much in a given section, but a given distance from the last hit is called dealer signing or a dealer signature.
Experts have lined up on either side of the dealer signature issue -- some yea, some nay. Essentially, it boils down to a matter of belief. Some experts believe that some dealers unconsciously do this; some experts believe there is no consistency to the distance that the ball travels from one spin to the next and, with the changing rotor spin over time, it would be impossible to achieve consistency anyway.
However, the dealer signature is an interesting concept and could have some credence because -- one: it makes sense, and two, like Mulder on The X-Files, we want to believe it's true. Of course, if one could follow a thousand dealers and record their spins over thousands of decisions, it might be possible to determine once and for all whether the signature idea is a myth or a reality. To this date, we know of no such extensive study as this. The actual accomplishing of such a study would be much more difficult than just the recording of thousands of dealers and thousands of their spins.
Since we are looking for an unconscious ability that these dealers might have, we wouldn't want them to know that we are studying them because that would affect their spins. Once dealers realized that we were looking at them specifically, they would become highly conscious of what they were doing. If any signature actually existed with such a dealer, their awareness of their spinning technique would very quickly erase whatever signature they had. So the study of possible signatures would have to be done surreptitiously, without the dealer noticing, and there's the rub. How could a researcher stand by a dealer's table, follow the dealer from table to table, hour after hour, day after day, recording and analyzing his spins without the dealer becoming aware of such a person? At first the dealer might think that the wheel was being clocked, but it wouldn't take long for him to suspect that it was his spins that were being clocked. Even if the dealer thought it was the machine being clocked, this still might cause him to alter his spin. But anything that is dealer-dependent and dependent on the dealer being unaware is immediately changed when the dealer becomes aware. In this case, as in Quantum Mechanics in physics, the observer interferes with the observed by the mere fact that he is observing!
Still, if dealer signatures exist, certainly they would be exploitable in long and short-term play, especially short-term play as the gradual slowing of the wheel's spin would not affect the signature quite so drastically. Still analyzing signatures is a technique of play that might be able to change the edge in our favor. It's worth a try.
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