optical flat
Date: circa 1946
Inventory Number: 2003-1-0152
Classification: Optical Flat
Dimensions:glass: 2.1 × 7.5 × 7.5 cm (13/16 × 2 15/16 × 2 15/16 in.)
case: 6 × 15.5 × 15.8 cm (2 3/8 × 6 1/8 × 6 1/4 in.)
Accessories: case
Description:
Clear Pyrex cylindrical optical flat in mahogany case. There is a note in the case that says: "#2, 2-3 micro (?) M.C.N. 7-16-46". The corrected side of the test plate is opposite the N.G.F. marking on the plate." Good side of plate is heavily scratched.