Bob Wiley of Bausch & Lomb, at M.I.T., working the ruling engine fitted with Babcock monorail. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
Scientists Spectrum analysis--Instruments Diffraction gratings Machinery Bausch & Lomb Optical Company Massachusetts Institute of Technology Wiley, Bob Photographic prints. (gmgpc)
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