One of our readers sent these pictures of a tool he found. We're not sure what it is, I'm guessing some sort of layout tool? The cross piece is 12" and what look like trammels (without points or holes in the end) are 2 3/4" long and can can be moved laterally.The handle is 5 1/2" long. The centerpiece is sharpened somewhat. Age is unknown. Anyone have any ideas?