readers feel free to visit TuneLand
http://tuneland.forumotion.com/
The audiophile forum that gives detailed info on this topic including pictures, diagrams and many active in-room systems with threads. You'll find TuneLand to have a ton less confusion for those of you who would like to read without the spins (we are troll free). We give a list of different types of wood and the long history of mechanical transfer.
thank you for your emails!
Michael Green