Diffraction gratings

Bell Telephone Laboratories laser beam
Small ruling machine at Mount Wilson Observatory
Large ruling engine at Mount Wilson Observatory
De Khotinsky with ruling engine
National Bureau of Standards Infrared Grating Spectrograph, using 1 meter-focus off-axis parabola
Albert Michelson's Ruling Engine No. 2
Albert Michelson's Ruling Engine No. 1
Albert Michelson's Ruling Engine No.1 showing detail of the diamond cutting head and carriage
Albert Michelson's Ruling Engine No.1 for ruling diffraction gratings
Rowland Grating Ruling Engine
Robert Williams Wood with his mosaic replica diffraction grating at Johns Hopkins University
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