This is a certified precision Bausch & Lomb optical grating. It was removed from a 1 meter monochromator system. Much of the following information was taken from the nomenclature label fixed to the back of the grating substrate.

Grating size - Substrate 100mm diameter
Grating area - 50 x 80 mm
Focal length - 998.8mm
Grooves / mm - 1200
Blaze angle - 5 degrees 52 minutes
Catalog number - 33-52-23-71
Serial number - 556 A5 B3
Coating - Al (?)

This grating appears to be in unblemished condition and includes a special protective plastic cover. It is in a box marked 'for 1M V-UV Spectrometer'. The grating has a very thick protective flat taped over the concave surface.

Photo set 1662