These are the 'specialty' rules I currently have, divided into several arbitrary categories. If anyone can suggest a better system of categories, I would certainly be open to that discussion. And, of course, I realize that a lot of these 'rules' aren't actually 'slide rules' (they don't have a minimum of a C/D scale combination that would allow them to do elementary multiplication or division); they are nomographs of varying complexity. The rules listed on this page are also included in the main listing of all the rules.