This is an online guide to understanding the barrister bookcase.  It will be a work in evolution.  Starting with the most common and sought-after manufacturer, Globe Wernicke. 

THIS LINK TO THE GUIDE, in progress!   http://blogs.ebay.com/sigfindoc/entry/Globe-Wernicke-Barrister-Bookcases-The-Elastic-B/_W0QQidZ1205011#comments

I am working on this and more information will be added as I have time.