This grating was made for Jerrell-Ash by Bausch & Lomb. Much of the following information was taken from the nomenclature label fixed to the back of the grating substrate.

Grating size - 60 x 60 mm
Focal length - infinity
Grooves / mm - 295
Blazed at 210nm
Catalog number 985-30-40-36
Coating - Al (?)

The grating is in excellent condition. There are a very few motes of dust here and there which I did not attempt to remove. The grating includes a convex protective cover.

Photo set 1650