Another what is it thread

Jim F

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These came with my mill when I bought it.
Not sure what they are.
 

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I think this is what your second item is . This is a Starrett no. 457 it is used to measure a taper of less than about 8 degrees. It's main use would be in die molds to measure the draft. Yours seams to be missing the small rule that runs under the pointer. Moving the rule moves the pointer to read out the degrees. I am sure some one here can explain it better
 
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