Description

A large A large certified precision ruled diffraction grating by Bausch & Lomb of Rochester, New York.

600 grooves / mm
Blaze angle 28 degrees, 41 minutes.
Radius concave

Serial number: 889-8-1-3
Catalogue number 35 53 12 55

16 x 15.5 x 3 cm. (window: 10 x 13.5 cm).

For a similar diffraction grating by Bausch and Lomb see the collection of the Smithsonian National Air and Space Museum. Inventory Number: A19980111000