Bausch & Lomb (B&L) 983-30-19-20  Precision Grating, 1200 Groove / mm, Excellent Condition

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 - 1200
Blazed at 400nm
Catalog number 983-30-19-20
Part number H4000
Coating - Al (?)

The grating has a very slight haze in the coating with a very faint mottled appearance and a very fine scratch on the surface, but is otherwise in excellent condition. It includes the Jerrel-Ash holder as shown in the photos.

Photo set 1652