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Top of the 75-foot spectrograph and switchboard in the 150-foot tower telescope, Mount Wilson Observatory. The vertical switchboard is seen behind the spectrograph. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
Spectrograph Spectrum analysis--Instruments Astronomical instruments Scientific apparatus and instruments Electric apparatus and appliances Electric switchgear Interiors Mount Wilson Observatory (Calif.) Photographic prints. (gmgpc)