Here are a couple of youtube videos describing the function of manual transmissions. I found them very informative. The first is especially good -- even though it was produced in 1936 !!!
Enjoy:
http://www.youtube.com/watch?v=aFvj6RQOLtM
http://www.youtube.com/watch?v=IKywZ730JFs
Enjoy:
http://www.youtube.com/watch?v=aFvj6RQOLtM
http://www.youtube.com/watch?v=IKywZ730JFs