So my wife found this in her grandmother's house and brought it home. I'm trying to figure out what it is. It has 5 plates of glass in it, but each plate appears to be identical. They are not curved or tinted. Any ideas what this might be?
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annealing is heating metal and allowing it to cool on their own to allow the molecules to expand and making the metal softer for forming. They use scribes to check the hardness of the metal, so these glass lenses are different hardnesses to calibrate the scribes that scratch the metal. You scratch the glass, you are harder than the rating of the scribe.Last edited by anotheridiot; March 4, 2014, 09:29 AM.
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