Leslie Speaker Information/How Does A Leslie Speaker Work?

How does a Leslie speaker work? Here is some info about Leslie speakers. If you have any questions please feel free to leave them in the comments. The two leslies used in the video are a model 147 and a model 125. Below there are links to more information/places to get parts.
For helpful information:
www.captain-foldback.com/
For parts:
www.tonewheelgeneral.com/
For great covers/panels:
b3guys.com/leslie_speaker_pad...