ID an old device
December 22, 2007 9:03 PM Subscribe
What is this device (180KB jpg)? My dad has had it for years but doesn't know what it's purpose is. It has a jaw that opens (103KB) and a scale (67KB) that reads up to 72, labeled every six divisions, and closes with an odd spring. I don't think that's in degrees since the jaw does not open that wide. It's obviously for measuring something but what that something is we can't figure out. My brother's idea was something involving maps. It is made of steel except for the brass scale.