junkdealer
Plastic
- Joined
- Mar 27, 2020
I recently bought some surplus items from NIST (National Institute of Science and Technology) and one item was a wooden storage crate with 3 glass discs. All are 20" in diameter, one is 3" thick and two are 3 1/2" thick. Look to be very heavy! The 3" disc is polished both sides, and the 3 1/2" thick discs have about a 1/2" wide groove around the perimeter and are silver coated on one side. The thicker discs seem to have some small internal bubbles, and the 3" thick disc is optically clear with no obvious internal flaws.
These came with a Universal Measuring Machine a Inspection Comparator, a Gage Comparator and some other measuring machines.
I am thinking the 3" disc could be an optical flat, and the others are mirrors of some type.
Any ideas as to what these are would be appreciated.
I appreciate your thoughts!
Dan
These came with a Universal Measuring Machine a Inspection Comparator, a Gage Comparator and some other measuring machines.
I am thinking the 3" disc could be an optical flat, and the others are mirrors of some type.
Any ideas as to what these are would be appreciated.
I appreciate your thoughts!
Dan