[IKE]

That book will leave out the most common CVT which is the rubber belt with expandable sheaves. This type is used on many snowmobiles, mini-bikes, and SAE Mini-Baja cars. This style CVT s really cool because it has passive controls that basically shift it into a lower "gear" as there is a higher torque request. This is accomplished by a cam style spring loaded clamping mechanism on the sheaves (pulleys).

Best of luck. Also, There is a really interesting way of running a CVT with a differential like arrangement in such a manner as to create a geared or locked neutral.