Over at Cool Tools, Bill Potter asks, "I came across this contraption in my dad’s tool collection after he passed away. He was an electrical engineer/computer science guy, so I’m pretty sure it had nothing to do with his work. Any ideas?"
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects