I'll try it without the pic first, if nobody can answer then I'll break out the camera.
I have part of a tool. No maker's mark anywhere, just the number 19 stamped on the back. Basically it's a big metal circle with an arm that swings around it and a bracket on the back for mounting on something else.
Here's the interesting thing - the circle has a grooved edge like a quarter. And the arm that swings around has two little pins to sit in those grooves and stop the arm at any position.
And the really interesting thing (to me at least but I'm easily impressed) is that the circle is graduated. Not 360 degrees. It's also not 6400 mils, so it's not an artillery related piece. It's divided into 500 parts which is an unusual division for a circle.
So aside from some failed metric circle experiment, I really don't know where to start looking for answers. Does this ring a bell with anyone?
thanks again
Joe
I have part of a tool. No maker's mark anywhere, just the number 19 stamped on the back. Basically it's a big metal circle with an arm that swings around it and a bracket on the back for mounting on something else.
Here's the interesting thing - the circle has a grooved edge like a quarter. And the arm that swings around has two little pins to sit in those grooves and stop the arm at any position.
And the really interesting thing (to me at least but I'm easily impressed) is that the circle is graduated. Not 360 degrees. It's also not 6400 mils, so it's not an artillery related piece. It's divided into 500 parts which is an unusual division for a circle.
So aside from some failed metric circle experiment, I really don't know where to start looking for answers. Does this ring a bell with anyone?
thanks again
Joe