I wasn't sure where to put this thread... if it's in the wrong place, please move it. Anyways, i'm making a couple of posters for display and one of the showcases is featuing antique equipment like ohmmeters (Wheatstone bridge), ammeters, voltmeters, etc. I was wondering if anyone knew of any cool/quirky/interesting little facts about anything related to this subject that I could put into the poster? Almost anything will do. I just don't want to bore people by putting only V=IR stuff and how the innards work.