Dalai's Rules, II

Since my last post on the topic, I've acquired more classroom-sized slide rules.  At this point, I've got a reasonable sample of most of the brands and variations of these things.  There are really only two or three that I need to have a really complete collection.  But as you can see, I'm running out of wall space.  My ultimate plan is to donate the entire collection to my alma mater, if they have enough wall-space.  At least my old engineering school will know what a slide rule is...