Large certified precision ruled diffraction grating by Bausch & Lomb
By Bausch & Lomb
Located in London, GB
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: 88...
Mid-20th Century American Vintage Bausch Lomb Glasses
Aluminum









