What is it?

shell70634

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Mar 7, 2018
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Found this in with some machine tools. Can someone tell me what it is?
thing 1.jpeg
thing 2.jpeg
thing 3.jpeg
 
Not to state the obvious but appears to be for setting something up to a specific angle. Looks like it was meant to attach to a round rod. Worth it's
weight in brass. Mike
 
My first guess was a tool to measure angles. The wheel on one end is connected to the scale on the other end by a small drive belt. Or maybe to measure multiple items to insure they are concentric?
 
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